Quantum Information Processing
  • Non-Gaussian bosonic channels in the Tavis–Cummings model (2019/08/21 02:00)

    Abstract

    The time evolution of two-level atoms interacting with a single-mode radiation field through the Tavis–Cummings Hamiltonian is studied from the perspective of channel action on the radiation mode. The operator sum representation for the channel in the situation of one atom interacting in resonance with the radiation mode, and two atoms interacting in resonance with the radiation mode, is obtained in the Fock basis. The notions of entanglement breaking, extremality, non-classicality and non-Gaussianity are explored using the obtained operator sum representation. It is shown that the respective channels are not entanglement breaking, are extremal and can generate both non-classicality and non-Gaussianity.

  • Orbital angular momentum-encoded measurement device independent quantum key distribution under atmospheric turbulence (2019/08/21 02:00)

    Abstract

    In this paper, an orbital angular momentum (OAM)-encoded measurement device independent quantum key distribution (MDI-QKD) under atmospheric turbulence is analyzed. The turbulent effect on scattering the OAM states is quantified by the probability of receiving the initial OAM modes, in conjunction with Kolmogorov and non-Kolmogorov models. The key rates of the OAM-encoded MDI-QKD are obtained under various turbulent intensity. Simulation results show that with the increase in radial coordinate, the initial OAM states are gradually diverted to adjacent modes and eventually tend to be randomly distributed. Furthermore, the OAM-encoded MDI-QKD has a slightly longer maximum transmission distance than that of the polarization-encoded MDI-QKD.

  • Intercept-and-resend attack and improvement of semiquantum secure direct communication using EPR pairs (2019/08/21 02:00)

    Abstract

    Zhang et al. (Quantum Inf Process 16:117, 2017. https://doi.org/10.1007/s11128-017-1573-3) proposed a semiquantum secure direct communication (SQSDC) using Einstein–Podolsky–Rosen pairs. However, as shown in this study, an eavesdropper can reveal the sender’s secret message by performing an intercept-and-resend attack. Furthermore, an eavesdropper can also launch a modification attack to modify the sender’s secret message without being detected. Without considering these security issues, the SQSDC protocol could fail at providing the secret message. Thus, an improvement is proposed to circumvent these problems and to improve the qubit efficiency from 10 to 17%.

  • Non-Hermitian extensions of uncertainty relations with generalized metric adjusted skew information (2019/08/21 02:00)

    Abstract

    In quantum mechanics, it is well known that the Heisenberg–Schrödinger uncertainty relations hold for two non-commutative observables and density operator. Recently some people start to focus on the uncertainty relations for two non-commutative non-Hermitian operators and density operator. In this paper, we introduce the generalized metric adjusted skew information, generalized metric adjusted correlation measure and the related quantities for non-Hermitian operators. Various properties of them are discussed. Finally, we establish several generalizations of uncertainty relation expressed in terms of the generalized metric adjusted skew information and obtain several results including previous results which can be given as corollaries of our non-Hermitian extensions of Heisenberg-type or Schrödinger-type uncertainty relations.

  • Weak quantum correlation quantifiers with generalized entropies (2019/08/21 02:00)

    Abstract

    We define a broad class of quantum correlation quantifiers (QCQs) based on generalized entropies and projective measurements and compare it with the case where the measurements are weak for a broad class of weak measurements (WMs) that operate in finite-dimensional systems. We also propose a general way to define a WM using a measure of disturbance and show that the QCQs by these measurements are majorized by those defined by the projective ones. Our result strengthens the hypothesis that WMs reveal fewer quantum correlations than projective measurements in a way that depends very little on the type of the QCQ. Finally, we prove that the quantifier is increasing with the force of the measurement and, as an example, we analytically calculate a particular case using the linear entropy.

  • Multipartite quantum coherence and monogamy for Dirac fields subject to Hawking radiation (2019/08/21 02:00)

    Abstract

    We study the quantum coherence of Greenberger–Horne–Zeilinger-like states of multi-mode Dirac fields in the background of a Schwarzschild black hole. We find that the evolutions of both \(l_1\) -norm of coherence and relative entropy of coherence are similar, though the two measures are not completely compatible. The accessible coherence always degrades monotonically by the Hawking effect, and the inaccessible coherence increases from zero monotonically or non-monotonically, depending on the ratio of the inaccessible to the accessible number of modes. Both the accessible and inaccessible coherences have the phenomenon of freeze. The monogamies for the \(l_1\) -norm of coherence between the accessible and inaccessible modes are established.

  • Quantum annealing learning search for solving QUBO problems (2019/08/20 02:00)

    Abstract

    In this paper, we present a novel strategy to solve optimization problems within a hybrid quantum-classical scheme based on quantum annealing, with a particular focus on QUBO problems. The proposed algorithm implements an iterative structure where the representation of an objective function into the annealer architecture is learned and already visited solutions are penalized by a tabu-inspired search. The result is a heuristic search equipped with a learning mechanism to improve the encoding of the problem into the quantum architecture. We prove the convergence of the algorithm to a global optimum in the case of general QUBO problems. Our technique is an alternative to the direct reduction of a given optimization problem into the sparse annealer graph.

  • Practical quantum Byzantine protocol via nearly optimal entanglement resources (2019/08/20 02:00)

    Abstract

    The Byzantine General Problem is a well-known problem in distributed systems, Fitzi et al. (Phys Rev Lett 87(21):217901, 2001) and Gaertner et al. (Phys Rev Lett 100(7):070504, 2008) proposed slightly weaker 3-players Byzantine protocols using quantum entanglement, respectively. However, these protocols are difficult to be applied to the n-players situation, since they require a lot of complicated entangled quantum resources, and more seriously, they all face the risk of being attacked. In this work, we present a more practical protocol than previous proposals, which can be applied to the n-players containing t traitors ( \(t < \frac{n}{2}\) ) and only requires some very simple entangled states and a few digital signatures. Our protocol matches an incentives mechanism to achieve optimal efficiency: Only one round of execution and O(mn) message complexity are required, where m is a minor parameter of the protocol. (In the worst case, the entire network requires \(t+1\) rounds and \(O(n^2t)\) message complexity, yet the reward mechanism will prevent this situation.)

  • Graph comparison via nonlinear quantum search (2019/08/20 02:00)

    Abstract

    Graph comparison is an established NP-hard problem. In this paper, we present an efficiently scaling quantum algorithm which finds the size of the maximum common edge subgraph for any pair of unlabelled graphs and thus provides a meaningful measure of graph similarity. The algorithm makes use of a two-part quantum dynamic process: in the first part, we obtain information crucial for the comparison of two graphs through linear quantum computation. However, this information is hidden in the quantum system with such a vanishingly small amplitude that even quantum algorithms such as Grover’s search are not fast enough to distil it efficiently. In order to extract the information, we call upon techniques in nonlinear quantum computing to provide the speed-up necessary for an efficient algorithm. The linear quantum circuit requires \(\mathcal {O}(n^3 \log ^3 (n) \log \log (n))\) elementary quantum gates, and the nonlinear evolution under the Gross–Pitaevskii equation has a time scaling of \(\mathcal {O}(\frac{1}{g} n^2 \log ^3 (n) \log \log (n))\) , where n is the number of vertices in each graph and g is the strength of the Gross–Pitaevskii nonlinearity. Through this example, we demonstrate the power of nonlinear quantum search techniques to solve a subset of NP-hard problems.

  • Exploring maximal steered coherence and entanglement via quantum steering ellipsoid framework (2019/08/19 02:00)

    Abstract

    All two-qubit states can be characterized visually by a quantum steering ellipsoid (QSE) inside the Bloch sphere, and their quantum resources (such as entanglement and discord) can be directly reflected via the geometric properties of QSE. In this work, we obtain QSE of bipartite Werner state interacting with a reservoir and probe the effects of the strong coupling regime and weak coupling regime on the maximal steered coherence (MSC) and concurrence in QSE framework. It is concluded that the MSC can be identified by the length of x or y semiaxis of ellipsoid. Meanwhile, the concurrence is related to the lengths of x and z semiaxes of QSE. The information can flow bidirectionally between the qubit system and the non-Markovian environment, which can induce the shrink, inflation and movement of ellipsoid in the Bloch sphere. On the contrary, due to the decoherence of information within Markovian environment, the QSE gradually shrinks and then eventually disappears in the north pole of Bloch sphere. Therefore, the evolutions of MSC and concurrence can be mapped by the aforementioned dynamics of QSE. The results also reveal that MSC and concurrence can be enhanced by suppressing the degradation of ellipsoid’s semiaxis. Moreover, we investigate the inflation of QSE under filtering operation and derive the condition of increasing MSC. An optimal operation strength of filtering operation is also obtained. It is worth noting that MSC and concurrence can be frozen by the optimal strength in the strong coupling and weak coupling regimes.

  • Inevitable degradation and inconsistency of quantum coherence in a curved space-time (2019/08/19 02:00)

    Abstract

    Based on dynamic analyses on bipartition system, the frozen conditions and the inconsistency of quantum coherence are investigated when one qubit of initial state located in Garfinkle–Horowitz–Strominger (GHS) dilaton black hole. These conditions are derived that either the initial state is prepared in an incoherent state or only the antiparticles escape from the event horizon. In this sense, the degradation of coherence is unavoidable as the expansion of black hole. Moreover, the evolution trajectories of two coherence measures are explored, which are significantly affected by the initial state structure and the approximation quantization of black hole. We then conclude that this inconsistency is an intrinsic trait of coherence in the curved space-time. Additionally, we observe some relations among the norm coherences between different bipartition systems and, at the same time, obtain the entropy coherences with same expressions.

  • Two-level information hiding for quantum images using optimal LSB (2019/08/16 02:00)

    Abstract

    As a primary branch of information hiding, quantum image steganography has become one of the most popular areas of study in the field of security. In this paper, the two-level embedding approach for information hiding is surveyed using an optimal least significant bit (LSB) quantum steganography algorithm, which only modifies at most one qubit of the LSBs of each pixel to perform embedding. The first level is to hide the encrypted quantum secret image into a quantum watermark image, and the second level is to embed the quantum watermark image into a quantum cover image. Using the optimal LSB-based algorithm, the double embedding can make the position of embedding have a certain randomness, thus increasing security. In addition, the quantum secret image can be reconstructed by a series of inverse operations in the recovery phase; only the stego image and the key can extract the quantum secret image. The simulated experimental results and analysis demonstrate that the proposed scheme produces images of good visual quality, robustness and high security.

  • Comparing coherence measures for X states: Can quantum states be ordered based on quantum coherence? (2019/08/16 02:00)

    Abstract

    Quantum coherence is an essential resource for quantum information processing and various quantitative measures of it have been introduced. However, the interconnections between these measures are not yet understood properly. Here, using a large set of randomly prepared two-qubit X states (as well as general two-qubit states) and analytically obtained expressions of various measures of coherence (e.g., relative entropy of coherence, l1 norm of coherence, coherence via skew information, and first-order coherence), it is established that these measures of quantum coherence cannot be used to perform ordering of a set of quantum states based on the amount of coherence present in a state. Further, it is shown that for a given value of quantum coherence measured by the relative entropy of coherence, maximally nonlocal mixed states of X type [which are characterized by the maximal violation of the Clauser–Horne–Shimony–Holt (CHSH) inequality] have maximum quantum coherence as measured by l1 norm of coherence. In addition, the amount of coherence measured by l1 norm of coherence for a Werner state is found to be always less than that for a maximally nonlocal mixed state even when they possess an equal amount of coherence measured by the relative entropy of coherence. In our study, we have also explored the connection between the above resource theory-based measures of coherence and the recently introduced first-order coherence and maximum first-order coherence measures for two-qubit systems. We find that while there seems to be no obvious connection between the resource theory-based measures and first-order and maximum first-order coherence, a correlation seems to exist between the maximum first-order coherence and concurrence, both of which are basis independent quantities. These observations could be of use in obtaining a deeper understanding of the interconnections between various measures of quantum coherence.

  • Permutation-based special linear transforms with application in quantum image encryption algorithm (2019/08/16 02:00)

    Abstract

    A cryptographic system based on substitution–permutation network involves various linear and affine transforms in order to create diffusion in the ciphertext. In this paper, special linear unitary transforms associated with permutations of n distinct objects are designed. These transforms are composed of n components each of which is a controlled NOT operation. The domain of special linear transforms is the \(2^n\) -dimensional Hilbert space \({{\mathbb {H}}}^{\otimes n}\) , and these transforms define bijection from the set of computational basis onto itself. The latter characteristic of these transforms has enabled us to propose an efficient quantum image scrambling strategy. The application of special linear transform on the quantum state, which represents pixels positional information, results in the scrambled quantum state of positional information. On the other hand, its application on quantum state representing pixels value produces the encrypted quantum state. Accordingly, an efficient quantum image encryption algorithm based on special linear transforms and Chen chaotic dynamical system is presented for the novel quantum representation of color digital images (NCQI) model. Firstly, a selected pair of special linear transforms is employed to scramble the quantum image state of the original image. Then, the scrambled image is processed under the controlled special linear transforms determined by the values of three sequences generated from Chen chaotic system. The objective of this part is to encrypt color information of red, green and blue layers of the image. For an image of size \(2^n \times 2^n\) , the time complexity of the proposed quantum image scrambling method is 2n while the time complexity of the proposed quantum image encryption algorithm is \(O(2^{2n})\) , which is linear in the size of image. Finally, the simulation experiments are performed in order to measure the strength of proposed encryption algorithm. It is evident from the analyses of the simulation results that the newly proposed algorithm is fast, secure and reliable.

  • Minimum distance of the boundary of the set of PPT states from the maximally mixed state using the geometry of the positive semidefinite cone (2019/08/16 02:00)

    Abstract

    Using a geometric measure of entanglement quantification based on Euclidean distance of the Hermitian matrices (Patel and Panigrahi in Geometric measure of entanglement based on local measurement, 2016. arXiv:1608.06145), we obtain the minimum distance between the set of bipartite n-qudit density matrices with a positive partial transpose and the maximally mixed state. This minimum distance is obtained as \(\frac{1}{\sqrt{d^n(d^n-1)}}\) , which is also the minimum distance within which all quantum states are separable. An idea of the interior of the set of all positive semidefinite matrices has also been provided. A particular class of Werner states has been identified for which the PPT criterion is necessary and sufficient for separability in dimensions greater than six.

  • Experimental implementation of an NMR NOON state thermometer (2019/08/14 02:00)

    Abstract

    Utilizing the highly correlated quantum NOON states of spins, we have implemented a proof-of-principle quantum thermometer using the NMR technique for measuring the variation of local magnetic field with the temperature. The system used was the star topology system of hexafluorophosphate molecules, and the thermometer showed a sensitivity of \(85\,\mathrm{nT}/^\circ \) C. Using the hexafluorophosphate and the trimethylphosphite spin systems, we have quantified the advantage of the quantum protocol over the classical one for measuring magnetic field. The quantum protocol showed the best performance for the sensing time of \(T_\mathrm{max} = 20\,\) ms, where the errors in the measurement scaled as the Heisenberg limit 1 / N. The thermometer implementation provided measurements in the temperature with errors scaling approximately with the Heisenberg limit, more precisely \(N^{-0.94}\) .

  • Entanglement-assisted quantum error correction codes with length $$n=q^2+1$$ n = q 2 + 1 (2019/08/13 02:00)

    Abstract

    In this paper, by investigating \(q^2\) -cyclotomic coset modulo rn in detail, where q is a prime power, \(n=q^2+1\) and \(r\mid (q+1)\) , series of entanglement-assisted quantum error correction (EAQEC) codes with flexible parameters of length n are constructed from constacyclic codes (including cyclic codes). Most of our EAQEC codes are new and have large minimum distance. As to EAQEC codes constructed from cyclic codes, their all possible parameters are determined completely. When minimum distance \(d\le \frac{n+2}{2}\) , all of our constructed EAQEC codes are entanglement-assisted quantum MDS (EAQMDS) codes. Those previously known EAQMDS codes with the same length in Fan et al. (Quantum Inf Comput 16:423–434, 2016), Chen et al. (Quantum Inf Process 16(303):1–22, 2017), Lu et al. (Finite Fields Their Appl 53:309–325, 2018), Mustafa and Emre (Comput Appl Math 38(75):1–13, 2019) and Qian and Zhang (Quantum Inf Process 18(71):1–12, 2019) are special cases of ours. Besides, some maximum entanglement EAQEC codes and maximum entanglement EAQMDS codes are derived as well.

  • Solutions for the MaxEnt problem with symmetry constraints (2019/08/13 02:00)

    Abstract

    In this paper, we deal with the situation in which the unknown state of a quantum system has to be estimated under the assumption that it is prepared obeying a known set of symmetries. We present a system of equations and an explicit solution for the problem of determining the MaxEnt state satisfying these constraints. Our approach can be applied to very general situations, including symmetries of the source represented by Lie and finite groups.

  • Nonclassicality of Dirac–Pauli quantum states (2019/08/12 02:00)

    Abstract

    In classical physics, a joint measurement of two compatible observables on an enlarged system–apparatus state usually implies that the joint statistics of the corresponding specific system observables are always separable. In this paper, we show that, for the quantum states with its density operators composed of the Dirac–Pauli matrices, the joint statistics of these specific system observables are entangled and the data inversion of the joint statistical distribution is negative. This nonclassical property, which can be revealed by an experimental scheme based on the homodyne detection, maybe helps us to understand the nonlocal features of the quantum tests of the Bell type. When we consider these Dirac–Pauli states as \(2\times 2\) bipartite ones, these bipartite states have a nonzero quantum discord although they are separable.

  • Improving the performance of four-intensity decoy-state measurement-device-independent quantum key distribution via heralded pair-coherent sources (2019/08/12 02:00)

    Abstract

    Measurement-device-independent quantum key distribution (MDI-QKD) can remove all the side-channel attacks and significantly improve the secure transmission distance. However, the key generation rate is relatively low when taking finite-key-size effect into consideration. In this manuscript, we adopt the latest four-intensity decoy-state scheme combining the heralded pair-coherent sources to study the performance of the MDI-QKD. Moreover, through utilizing joint constraints and collective error estimation techniques, we can obviously improve the performance of practical MDI-QKD systems compared with those using weak coherent sources or heralded single-photon sources.

Physical Review Letters
  • Quantum Interference between Light Sources Separated by 150 Million Kilometers by Yu-Hao Deng, Hui Wang, Xing Ding, Z.-C. Duan, Jian Qin, M.-C. Chen, Yu He, Yu-Ming He, Jin-Peng Li, Yu-Huai Li, Li-Chao Peng, E. S. Matekole, Tim Byrnes, C. Schneider, M. Kamp, Da-Wei Wang, Jonathan P. Dowling, Sven Höfling, Chao-Yang Lu, Marlan O. Scully, and Jian-Wei Pan (2019/08/21 12:00)
    Author(s): Yu-Hao Deng, Hui Wang, Xing Ding, Z.-C. Duan, Jian Qin, M.-C. Chen, Yu He, Yu-Ming He, Jin-Peng Li, Yu-Huai Li, Li-Chao Peng, E. S. Matekole, Tim Byrnes, C. Schneider, M. Kamp, Da-Wei Wang, Jonathan P. Dowling, Sven Höfling, Chao-Yang Lu, Marlan O. Scully, and Jian-Wei Pan

    Researchers witness quantum interference and entanglement between photons from sources 150 million km apart—the Sun and a quantum dot in their lab.


    [Phys. Rev. Lett. 123, 080401] Published Wed Aug 21, 2019
  • Neutron Star Heating Constraints on Wave-Function Collapse Models by Antoine Tilloy and Thomas M. Stace (2019/08/21 12:00)
    Author(s): Antoine Tilloy and Thomas M. Stace

    Spontaneous wave-function collapse models, like continuous spontaneous localization, are designed to suppress macroscopic superpositions while preserving microscopic quantum phenomena. An observable consequence of collapse models is spontaneous heating of massive objects. We calculate the collapse-i...


    [Phys. Rev. Lett. 123, 080402] Published Wed Aug 21, 2019
  • Open Quantum Symmetric Simple Exclusion Process by Denis Bernard and Tony Jin (2019/08/21 12:00)
    Author(s): Denis Bernard and Tony Jin

    We present the solution to a model of fermions hopping between neighboring sites on a line with random Brownian amplitudes and open boundary conditions driving the system out of equilibrium. The average dynamics reduces to that of the symmetric simple exclusion process. However, the full distributio...


    [Phys. Rev. Lett. 123, 080601] Published Wed Aug 21, 2019
  • Observation of Topological Magnon Insulator States in a Superconducting Circuit by W. Cai, J. Han, Feng Mei, Y. Xu, Y. Ma, X. Li, H. Wang, Y. P. Song, Zheng-Yuan Xue, Zhang-qi Yin, Suotang Jia, and Luyan Sun (2019/08/20 12:00)
    Author(s): W. Cai, J. Han, Feng Mei, Y. Xu, Y. Ma, X. Li, H. Wang, Y. P. Song, Zheng-Yuan Xue, Zhang-qi Yin, Suotang Jia, and Luyan Sun

    A chain of superconducting qubits reproduces two key features of topological insulators.


    [Phys. Rev. Lett. 123, 080501] Published Tue Aug 20, 2019
  • Critical Behavior and Fractality in Shallow One-Dimensional Quasiperiodic Potentials by Hepeng Yao, Hakim Khoudli, Léa Bresque, and Laurent Sanchez-Palencia (2019/08/16 12:00)
    Author(s): Hepeng Yao, Hakim Khoudli, Léa Bresque, and Laurent Sanchez-Palencia

    Quasiperiodic systems offer an appealing intermediate between long-range ordered and genuine disordered systems, with unusual critical properties. One-dimensional models that break the so-called self-dual symmetry usually display a mobility edge, similarly as truly disordered systems in a dimension ...


    [Phys. Rev. Lett. 123, 070405] Published Fri Aug 16, 2019
  • Orbital-Angular-Momentum Multiplexed Continuous-Variable Entanglement from Four-Wave Mixing in Hot Atomic Vapor by Xiaozhou Pan, Sheng Yu, Yanfen Zhou, Kun Zhang, Kai Zhang, Shuchao Lv, Sijin Li, Wei Wang, and Jietai Jing (2019/08/16 12:00)
    Author(s): Xiaozhou Pan, Sheng Yu, Yanfen Zhou, Kun Zhang, Kai Zhang, Shuchao Lv, Sijin Li, Wei Wang, and Jietai Jing

    Multiplexing is crucial for the data-carrying capacity of information communication systems. Orbital angular momentum (OAM) with a topological charge $ℓ$ ($ℓ$ integer) provides a degree of freedom to realize multiplexing. In this Letter, we report an experimental implementation of OAM multiplexed co...


    [Phys. Rev. Lett. 123, 070506] Published Fri Aug 16, 2019
  • Towards Low Overhead Magic State Distillation by Anirudh Krishna and Jean-Pierre Tillich (2019/08/16 12:00)
    Author(s): Anirudh Krishna and Jean-Pierre Tillich

    Magic-state distillation is a resource intensive subroutine for quantum computation. The ratio of noisy input states to output states with an error rate at most $ε$ scales as $O\mathbf{(}{\mathrm{log}}^{γ}(1/ε)\mathbf{)}$ [S. Bravyi and J. Haah, Magic-state distillation with low overhead, Phys. Rev....


    [Phys. Rev. Lett. 123, 070507] Published Fri Aug 16, 2019
  • Three-Photon Discrete-Energy-Entangled $W$ State in an Optical Fiber by B. Fang, M. Menotti, M. Liscidini, J. E. Sipe, and V. O. Lorenz (2019/08/16 12:00)
    Author(s): B. Fang, M. Menotti, M. Liscidini, J. E. Sipe, and V. O. Lorenz

    We experimentally demonstrate the generation of a three-photon discrete-energy-entangled $W$ state using multiphoton-pair generation by spontaneous four-wave mixing in an optical fiber. We show that, by making use of prior information on the photon source, we can verify the state produced by this so...


    [Phys. Rev. Lett. 123, 070508] Published Fri Aug 16, 2019
  • Limits on Correlations in Networks for Quantum and No-Signaling Resources by Marc-Olivier Renou, Yuyi Wang, Sadra Boreiri, Salman Beigi, Nicolas Gisin, and Nicolas Brunner (2019/08/15 12:00)
    Author(s): Marc-Olivier Renou, Yuyi Wang, Sadra Boreiri, Salman Beigi, Nicolas Gisin, and Nicolas Brunner

    A quantum network consists of independent sources distributing entangled states to distant nodes which can then perform entangled measurements, thus establishing correlations across the entire network. But how strong can these correlations be? Here we address this question, by deriving bounds on pos...


    [Phys. Rev. Lett. 123, 070403] Published Thu Aug 15, 2019
  • Fermi-Liquid Description of a Single-Component Fermi Gas with $p$-Wave Interactions by Shanshan Ding and Shizhong Zhang (2019/08/15 12:00)
    Author(s): Shanshan Ding and Shizhong Zhang

    We study the Fermi liquid properties of a single component Fermi gas with $p$-wave interactions. In the weak repulsive limit, we obtain exact perturbative expansions for the ground state energy, the chemical potential, and the effective mass of the Landau quasiparticle up to second order in scatteri...


    [Phys. Rev. Lett. 123, 070404] Published Thu Aug 15, 2019
  • Optical Interferometry with Quantum Networks by E. T. Khabiboulline, J. Borregaard, K. De Greve, and M. D. Lukin (2019/08/15 12:00)
    Author(s): E. T. Khabiboulline, J. Borregaard, K. De Greve, and M. D. Lukin

    We propose a method for optical interferometry in telescope arrays assisted by quantum networks. In our approach, the quantum state of incoming photons along with an arrival time index are stored in a binary qubit code at each receiver. Nonlocal retrieval of the quantum state via entanglement-assist...


    [Phys. Rev. Lett. 123, 070504] Published Thu Aug 15, 2019
  • Quantum Teleportation in High Dimensions by Yi-Han Luo, Han-Sen Zhong, Manuel Erhard, Xi-Lin Wang, Li-Chao Peng, Mario Krenn, Xiao Jiang, Li Li, Nai-Le Liu, Chao-Yang Lu, Anton Zeilinger, and Jian-Wei Pan (2019/08/15 12:00)
    Author(s): Yi-Han Luo, Han-Sen Zhong, Manuel Erhard, Xi-Lin Wang, Li-Chao Peng, Mario Krenn, Xiao Jiang, Li Li, Nai-Le Liu, Chao-Yang Lu, Anton Zeilinger, and Jian-Wei Pan

    The first experiment to teleport qutrits rather than qubits paves the way to teleporting the complete quantum state of a particle.


    [Phys. Rev. Lett. 123, 070505] Published Thu Aug 15, 2019
  • Random Compiler for Fast Hamiltonian Simulation by Earl Campbell (2019/08/14 12:00)
    Author(s): Earl Campbell

    A new way to simulate a molecule is potentially much faster than other approaches because it relies on random—as opposed to deterministic—sequences of operations.


    [Phys. Rev. Lett. 123, 070503] Published Wed Aug 14, 2019
  • Extendibility Limits the Performance of Quantum Processors by Eneet Kaur, Siddhartha Das, Mark M. Wilde, and Andreas Winter (2019/08/13 12:00)
    Author(s): Eneet Kaur, Siddhartha Das, Mark M. Wilde, and Andreas Winter

    Resource theories in quantum information science are helpful for the study and quantification of the performance of information-processing tasks that involve quantum systems. These resource theories also find applications in other areas of study; e.g., the resource theories of entanglement and coher...


    [Phys. Rev. Lett. 123, 070502] Published Tue Aug 13, 2019
  • Continuous-Time Random Walk for a Particle in a Periodic Potential by Andreas Dechant, Farina Kindermann, Artur Widera, and Eric Lutz (2019/08/13 12:00)
    Author(s): Andreas Dechant, Farina Kindermann, Artur Widera, and Eric Lutz

    Continuous-time random walks offer powerful coarse-grained descriptions of transport processes. We here microscopically derive such a model for a Brownian particle diffusing in a deep periodic potential. We determine both the waiting-time and the jump-length distributions in terms of the parameters ...


    [Phys. Rev. Lett. 123, 070602] Published Tue Aug 13, 2019
  • Out-of-Equilibrium Clock Model at the Verge of Criticality by Marc Suñé and Alberto Imparato (2019/08/13 12:00)
    Author(s): Marc Suñé and Alberto Imparato

    We consider an out-of-equilibrium lattice model consisting of 2D discrete rotators, in contact with heat reservoirs at different temperatures. The equilibrium counterpart of such a model, the clock model, exhibits three phases: a low-temperature ordered phase, a quasiliquid phase, and a high-tempera...


    [Phys. Rev. Lett. 123, 070601] Published Tue Aug 13, 2019
  • Deterministic Coherence Distillation by C. L. Liu and D. L. Zhou (2019/08/13 12:00)
    Author(s): C. L. Liu and D. L. Zhou

    Coherence distillation is one of the central problems in the resource theory of coherence. In this Letter, we complete the deterministic distillation of quantum coherence for a finite number of coherent states under strictly incoherent operations. Specifically, we find the necessary and sufficient c...


    [Phys. Rev. Lett. 123, 070402] Published Tue Aug 13, 2019
  • Quantifying the Incompatibility of Quantum Measurements Relative to a Basis by Georgios Styliaris and Paolo Zanardi (2019/08/12 12:00)
    Author(s): Georgios Styliaris and Paolo Zanardi

    Motivated by quantum resource theories, we introduce a notion of incompatibility for quantum measurements relative to a reference basis. The notion arises by considering states diagonal in that basis and investigating whether probability distributions associated with different quantum measurements c...


    [Phys. Rev. Lett. 123, 070401] Published Mon Aug 12, 2019
  • Deterministic Generation of Large-Scale Entangled Photonic Cluster State from Interacting Solid State Emitters by Mercedes Gimeno-Segovia, Terry Rudolph, and Sophia E. Economou (2019/08/12 12:00)
    Author(s): Mercedes Gimeno-Segovia, Terry Rudolph, and Sophia E. Economou

    The ability to create large highly entangled “cluster” states is crucial for measurement-based quantum computing. We show that deterministic multiphoton entanglement can be created from coupled solid state quantum emitters without the need for any two-qubit gates and regardless of whether the emitte...


    [Phys. Rev. Lett. 123, 070501] Published Mon Aug 12, 2019
  • Deterministic Entanglement Swapping in a Superconducting Circuit by Wen Ning, Xin-Jie Huang, Pei-Rong Han, Hekang Li, Hui Deng, Zhen-Biao Yang, Zhi-Rong Zhong, Yan Xia, Kai Xu, Dongning Zheng, and Shi-Biao Zheng (2019/08/09 12:00)
    Author(s): Wen Ning, Xin-Jie Huang, Pei-Rong Han, Hekang Li, Hui Deng, Zhen-Biao Yang, Zhi-Rong Zhong, Yan Xia, Kai Xu, Dongning Zheng, and Shi-Biao Zheng

    Entanglement swapping, the process to entangle two particles without coupling them in any way, is one of the most striking manifestations of the quantum-mechanical nonlocal characteristic. Besides fundamental interest, this process has applications in complex entanglement manipulation and quantum co...


    [Phys. Rev. Lett. 123, 060502] Published Fri Aug 09, 2019
  • Non-Abelian Geometric Dephasing by Kyrylo Snizhko, Reinhold Egger, and Yuval Gefen (2019/08/09 12:00)
    Author(s): Kyrylo Snizhko, Reinhold Egger, and Yuval Gefen

    Fluctuations in adiabatic quantum transport in systems coupled to a bath result in a type of geometric dephasing with clear signatures in interference experiments.


    [Phys. Rev. Lett. 123, 060405] Published Fri Aug 09, 2019
  • Benchmarking Maximum-Likelihood State Estimation with an Entangled Two-Cavity State by V. Métillon, S. Gerlich, M. Brune, J. M. Raimond, P. Rouchon, and I. Dotsenko (2019/08/09 12:00)
    Author(s): V. Métillon, S. Gerlich, M. Brune, J. M. Raimond, P. Rouchon, and I. Dotsenko

    The efficient quantum state reconstruction algorithm described by Six et al. [Phys. Rev. A 93, 012109 (2016)] is experimentally implemented on the nonlocal state of two microwave cavities entangled by a circular Rydberg atom. We use information provided by long sequences of measurements performed by...


    [Phys. Rev. Lett. 123, 060404] Published Fri Aug 09, 2019
  • Randomized Benchmarking for Individual Quantum Gates by E. Onorati, A. H. Werner, and J. Eisert (2019/08/09 12:00)
    Author(s): E. Onorati, A. H. Werner, and J. Eisert

    Any technology requires precise benchmarking of its components, and the quantum technologies are no exception. Randomized benchmarking allows for the relatively resource economical estimation of the average gate fidelity of quantum gates from the Clifford group, assuming identical noise levels for a...


    [Phys. Rev. Lett. 123, 060501] Published Fri Aug 09, 2019
  • Many-Body Entanglement in Short-Range Interacting Fermi Gases for Metrology by Leonardo Lucchesi and Maria Luisa Chiofalo (2019/08/09 12:00)
    Author(s): Leonardo Lucchesi and Maria Luisa Chiofalo

    We explore many-body entanglement in spinful Fermi gases with short-range interactions, for metrology purposes. We characterize the emerging quantum phases via density-matrix renormalization group simulations and quantify their entanglement content for metrological usability via quantum Fisher infor...


    [Phys. Rev. Lett. 123, 060406] Published Fri Aug 09, 2019
  • Realization of the Einstein-Podolsky-Rosen Paradox Using Radial Position and Radial Momentum Variables by Lixiang Chen, Tianlong Ma, Xiaodong Qiu, Dongkai Zhang, Wuhong Zhang, and Robert W. Boyd (2019/08/08 12:00)
    Author(s): Lixiang Chen, Tianlong Ma, Xiaodong Qiu, Dongkai Zhang, Wuhong Zhang, and Robert W. Boyd

    Correlations between the radial position and radial momentum of entangled photons demonstrate the suitability of these properties for quantum information applications.


    [Phys. Rev. Lett. 123, 060403] Published Thu Aug 08, 2019
  • Absence of Energy Currents in an Equilibrium State and Chiral Anomalies by Anton Kapustin and Lev Spodyneiko (2019/08/06 12:00)
    Author(s): Anton Kapustin and Lev Spodyneiko

    A long time ago, Bloch showed that in a system of interacting nonrelativistic particles the net particle-number current must vanish in any equilibrium state. Bloch’s argument does not generalize easily to the energy current. We devise an alternative argument which proves the vanishing of the net ene...


    [Phys. Rev. Lett. 123, 060601] Published Tue Aug 06, 2019
  • Majorana Corner Modes with Solitons in an Attractive Hubbard-Hofstadter Model of Cold Atom Optical Lattices by Chuanchang Zeng, T. D. Stanescu, Chuanwei Zhang, V. W. Scarola, and Sumanta Tewari (2019/08/06 12:00)
    Author(s): Chuanchang Zeng, T. D. Stanescu, Chuanwei Zhang, V. W. Scarola, and Sumanta Tewari

    Higher-order topological superconductors hosting Majorana-Kramers pairs (MKPs) as corner modes have recently been proposed in a two-dimensional quantum spin Hall insulator proximity-coupled to unconventional cuprate or iron-based superconductors. Here, we show that such MKPs can be realized using a ...


    [Phys. Rev. Lett. 123, 060402] Published Tue Aug 06, 2019
  • Observing the Quantum Wave Nature of Free Electrons through Spontaneous Emission by Roei Remez, Aviv Karnieli, Sivan Trajtenberg-Mills, Niv Shapira, Ido Kaminer, Yossi Lereah, and Ady Arie (2019/08/06 12:00)
    Author(s): Roei Remez, Aviv Karnieli, Sivan Trajtenberg-Mills, Niv Shapira, Ido Kaminer, Yossi Lereah, and Ady Arie

    We investigate, both experimentally and theoretically, the interpretation of the free-electron wave function using spontaneous emission. We use a transversely wide single-electron wave function to describe the spatial extent of transverse coherence of an electron beam in a standard transmission elec...


    [Phys. Rev. Lett. 123, 060401] Published Tue Aug 06, 2019
  • Nearly Optimal Lattice Simulation by Product Formulas by Andrew M. Childs and Yuan Su (2019/08/02 12:00)
    Author(s): Andrew M. Childs and Yuan Su

    We consider simulating an $n$-qubit Hamiltonian with nearest-neighbor interactions evolving for time $t$ on a quantum computer. We show that this simulation has gate complexity $(nt{)}^{1+o(1)}$ using product formulas, a straightforward approach that has been demonstrated by several experimental gro...


    [Phys. Rev. Lett. 123, 050503] Published Fri Aug 02, 2019
  • Excitation Spectrum of a Trapped Dipolar Supersolid and Its Experimental Evidence by G. Natale, R. M. W. van Bijnen, A. Patscheider, D. Petter, M. J. Mark, L. Chomaz, and F. Ferlaino (2019/08/01 12:00)
    Author(s): G. Natale, R. M. W. van Bijnen, A. Patscheider, D. Petter, M. J. Mark, L. Chomaz, and F. Ferlaino

    Researchers find new evidence that a Bose-Einstein condensate made of erbium atoms undergoes a phase transition into a bizarre form of quantum matter.


    [Phys. Rev. Lett. 123, 050402] Published Thu Aug 01, 2019
  • Characterization of Arbitrary-Order Correlations in Quantum Baths by Weak Measurement by Ping Wang, Chong Chen, Xinhua Peng, Jörg Wrachtrup, and Ren-Bao Liu (2019/08/01 12:00)
    Author(s): Ping Wang, Chong Chen, Xinhua Peng, Jörg Wrachtrup, and Ren-Bao Liu

    Correlations of fluctuations are the driving forces behind the dynamics and thermodynamics in quantum many-body systems. For qubits embedded in a quantum bath, the correlations in the bath are key to understanding and combating decoherence—a critical issue in quantum information technology. However,...


    [Phys. Rev. Lett. 123, 050603] Published Thu Aug 01, 2019
  • Extendibility of Bosonic Gaussian States by Ludovico Lami, Sumeet Khatri, Gerardo Adesso, and Mark M. Wilde (2019/07/31 12:00)
    Author(s): Ludovico Lami, Sumeet Khatri, Gerardo Adesso, and Mark M. Wilde

    Extendibility of bosonic Gaussian states is a key issue in continuous-variable quantum information. We show that a bosonic Gaussian state is $k$-extendible if and only if it has a Gaussian $k$-extension, and we derive a simple semidefinite program, whose size scales linearly with the number of local...


    [Phys. Rev. Lett. 123, 050501] Published Wed Jul 31, 2019
  • Stochastic Representation of Non-Markovian Fermionic Quantum Dissipation by Lu Han, Vladimir Chernyak, Yun-An Yan, Xiao Zheng, and YiJing Yan (2019/07/31 12:00)
    Author(s): Lu Han, Vladimir Chernyak, Yun-An Yan, Xiao Zheng, and YiJing Yan

    Quantum Brownian motion plays a fundamental role in many areas of modern physics. In the path-integral formulation, environmental fluctuations can be characterized by auxiliary stochastic fields. Intriguingly, for fermionic environments the stochastic fields must be Grassmann valued so as to memoriz...


    [Phys. Rev. Lett. 123, 050601] Published Wed Jul 31, 2019
  • Asymptotic Behavior of the Solution of the Space Dependent Variable Order Fractional Diffusion Equation: Ultraslow Anomalous Aggregation by Sergei Fedotov and Daniel Han (2019/07/31 12:00)
    Author(s): Sergei Fedotov and Daniel Han

    We find the asymptotic representation of the solution of the variable-order fractional diffusion equation, which remains unsolved since it was proposed by Chechkin, Gorenflo, and Sokolov [J. Phys. A, 38, L679 (2005)]. We identify a new advection term that causes ultraslow spatial aggregation of subd...


    [Phys. Rev. Lett. 123, 050602] Published Wed Jul 31, 2019
  • Propagation and Localization of Collective Excitations on a 24-Qubit Superconducting Processor by Yangsen Ye, Zi-Yong Ge, Yulin Wu, Shiyu Wang, Ming Gong, Yu-Ran Zhang, Qingling Zhu, Rui Yang, Shaowei Li, Futian Liang, Jin Lin, Yu Xu, Cheng Guo, Lihua Sun, Chen Cheng, Nvsen Ma, Zi Yang Meng, Hui Deng, Hao Rong, Chao-Yang Lu, Cheng-Zhi Peng, Heng Fan, Xiaobo Zhu, and Jian-Wei Pan (2019/07/30 12:00)
    Author(s): Yangsen Ye, Zi-Yong Ge, Yulin Wu, Shiyu Wang, Ming Gong, Yu-Ran Zhang, Qingling Zhu, Rui Yang, Shaowei Li, Futian Liang, Jin Lin, Yu Xu, Cheng Guo, Lihua Sun, Chen Cheng, Nvsen Ma, Zi Yang Meng, Hui Deng, Hao Rong, Chao-Yang Lu, Cheng-Zhi Peng, Heng Fan, Xiaobo Zhu, and Jian-Wei Pan

    Superconducting circuits have emerged as a powerful platform of quantum simulation, especially for emulating the dynamics of quantum many-body systems, because of their tunable interaction, long coherence time, and high-precision control. Here in experiments, we construct a Bose-Hubbard ladder with ...


    [Phys. Rev. Lett. 123, 050502] Published Tue Jul 30, 2019
  • Multipartite Entanglement Generation and Contextuality Tests Using Nondestructive Three-Qubit Parity Measurements by S. B. van Dam, J. Cramer, T. H. Taminiau, and R. Hanson (2019/07/29 12:00)
    Author(s): S. B. van Dam, J. Cramer, T. H. Taminiau, and R. Hanson

    We report on the realization and application of nondestructive three-qubit parity measurements on nuclear spin qubits in diamond. We use high-fidelity quantum logic to map the parity of the joint state of three nuclear spin qubits onto an electronic spin qubit that acts as an ancilla, followed by a ...


    [Phys. Rev. Lett. 123, 050401] Published Mon Jul 29, 2019
  • Probing Bayesian Credible Regions Intrinsically: A Feasible Error Certification for Physical Systems by Changhun Oh, Yong Siah Teo, and Hyunseok Jeong (2019/07/26 12:00)
    Author(s): Changhun Oh, Yong Siah Teo, and Hyunseok Jeong

    Standard computation of size and credibility of a Bayesian credible region for certifying any point estimator of an unknown parameter (such as a quantum state, channel, phase, etc.) requires selecting points that are in the region from a finite parameter-space sample, which is infeasible for a large...


    [Phys. Rev. Lett. 123, 040602] Published Fri Jul 26, 2019
  • Control-Enhanced Sequential Scheme for General Quantum Parameter Estimation at the Heisenberg Limit by Zhibo Hou, Rui-Jia Wang, Jun-Feng Tang, Haidong Yuan, Guo-Yong Xiang, Chuan-Feng Li, and Guang-Can Guo (2019/07/26 12:00)
    Author(s): Zhibo Hou, Rui-Jia Wang, Jun-Feng Tang, Haidong Yuan, Guo-Yong Xiang, Chuan-Feng Li, and Guang-Can Guo

    The advantage of quantum metrology has been experimentally demonstrated for phase estimations where the dynamics are commuting. General noncommuting dynamics, however, can have distinct features. For example, the direct sequential scheme, which can achieve the Heisenberg scaling for the phase estima...


    [Phys. Rev. Lett. 123, 040501] Published Fri Jul 26, 2019
  • Statistical Physics Approach to the Optimal Transport Problem by Patrice Koehl, Marc Delarue, and Henri Orland (2019/07/26 12:00)
    Author(s): Patrice Koehl, Marc Delarue, and Henri Orland

    Originally defined for the optimal allocation of resources, optimal transport (OT) has found many theoretical and practical applications in multiple domains of science and physics. In this Letter we develop a new method for solving the discrete version of this problem using techniques derived from s...


    [Phys. Rev. Lett. 123, 040603] Published Fri Jul 26, 2019
  • Retrieving Ideal Precision in Noisy Quantum Optical Metrology by Kai Bai, Zhen Peng, Hong-Gang Luo, and Jun-Hong An (2019/07/24 12:00)
    Author(s): Kai Bai, Zhen Peng, Hong-Gang Luo, and Jun-Hong An

    Quantum metrology employs quantum effects to attain a measurement precision surpassing the limit achievable in classical physics. However, it was previously found that the precision returns the shot-noise limit (SNL) from the ideal Zeno limit (ZL) due to the photon loss in quantum metrology based on...


    [Phys. Rev. Lett. 123, 040402] Published Wed Jul 24, 2019
  • Completely Positive Divisibility Does Not Mean Markovianity by Simon Milz, M. S. Kim, Felix A. Pollock, and Kavan Modi (2019/07/22 12:00)
    Author(s): Simon Milz, M. S. Kim, Felix A. Pollock, and Kavan Modi

    In the classical domain, it is well known that divisibility does not imply that a stochastic process is Markovian. However, for quantum processes, divisibility is often considered to be synonymous with Markovianity. We show that completely positive divisible quantum processes can still involve non-M...


    [Phys. Rev. Lett. 123, 040401] Published Mon Jul 22, 2019
  • Emergent Glassy Dynamics in a Quantum Dimer Model by Johannes Feldmeier, Frank Pollmann, and Michael Knap (2019/07/22 12:00)
    Author(s): Johannes Feldmeier, Frank Pollmann, and Michael Knap

    We consider the quench dynamics of a two-dimensional quantum dimer model and determine the role of its kinematic constraints. We interpret the nonequilibrium dynamics in terms of the underlying equilibrium phase transitions consisting of a Berezinskii-Kosterlitz-Thouless (BKT) transition between a c...


    [Phys. Rev. Lett. 123, 040601] Published Mon Jul 22, 2019
  • Direct Randomized Benchmarking for Multiqubit Devices by Timothy J. Proctor, Arnaud Carignan-Dugas, Kenneth Rudinger, Erik Nielsen, Robin Blume-Kohout, and Kevin Young (2019/07/19 12:00)
    Author(s): Timothy J. Proctor, Arnaud Carignan-Dugas, Kenneth Rudinger, Erik Nielsen, Robin Blume-Kohout, and Kevin Young

    Benchmarking methods that can be adapted to multiqubit systems are essential for assessing the overall or “holistic” performance of nascent quantum processors. The current industry standard is Clifford randomized benchmarking (RB), which measures a single error rate that quantifies overall performan...


    [Phys. Rev. Lett. 123, 030503] Published Fri Jul 19, 2019
  • Bath-Induced Decay of Stark Many-Body Localization by Ling-Na Wu and André Eckardt (2019/07/18 12:00)
    Author(s): Ling-Na Wu and André Eckardt

    We investigate the relaxation dynamics of an interacting Stark-localized system coupled to a dephasing bath, and compare its behavior to the conventional disorder-induced many body localized system. Specifically, we study the dynamics of population imbalance between even and odd sites, and the growt...


    [Phys. Rev. Lett. 123, 030602] Published Thu Jul 18, 2019
  • Heating-Induced Long-Range $η$ Pairing in the Hubbard Model by J. Tindall, B. Buča, J. R. Coulthard, and D. Jaksch (2019/07/17 12:00)
    Author(s): J. Tindall, B. Buča, J. R. Coulthard, and D. Jaksch

    We show how, upon heating the spin degrees of freedom of the Hubbard model to infinite temperature, the symmetries of the system allow the creation of steady states with long-range correlations between $η$ pairs. We induce this heating with either dissipation or periodic driving and evolve the syste...


    [Phys. Rev. Lett. 123, 030603] Published Wed Jul 17, 2019
  • Systematic Construction of Scarred Many-Body Dynamics in 1D Lattice Models by Kieran Bull, Ivar Martin, and Z. Papić (2019/07/15 12:00)
    Author(s): Kieran Bull, Ivar Martin, and Z. Papić

    We introduce a family of nonintegrable 1D lattice models that feature robust periodic revivals under a global quench from certain initial product states, thus generalizing the phenomenon of many-body scarring recently observed in Rydberg atom quantum simulators. Our construction is based on a system...


    [Phys. Rev. Lett. 123, 030601] Published Mon Jul 15, 2019
  • Experimental Implementation of Efficient Quantum Pseudorandomness on a 12-Spin System by Jun Li, Zhihuang Luo, Tao Xin, Hengyan Wang, David Kribs, Dawei Lu, Bei Zeng, and Raymond Laflamme (2019/07/15 12:00)
    Author(s): Jun Li, Zhihuang Luo, Tao Xin, Hengyan Wang, David Kribs, Dawei Lu, Bei Zeng, and Raymond Laflamme

    Quantum pseudorandomness, also known as unitary designs, comprises a powerful resource for emergent quantum technologies. Although in theory pseudorandom unitary operators can be constructed efficiently, realizing these objects in realistic physical systems is a challenging task. Here, we demonstrat...


    [Phys. Rev. Lett. 123, 030502] Published Mon Jul 15, 2019
  • Time Entanglement between a Photon and a Spin Wave in a Multimode Solid-State Quantum Memory by Kutlu Kutluer, Emanuele Distante, Bernardo Casabone, Stefano Duranti, Margherita Mazzera, and Hugues de Riedmatten (2019/07/15 12:00)
    Author(s): Kutlu Kutluer, Emanuele Distante, Bernardo Casabone, Stefano Duranti, Margherita Mazzera, and Hugues de Riedmatten

    The generation and distribution of entanglement are key resources in quantum repeater schemes. Temporally multiplexed systems offer time-bin encoding of quantum information which provides robustness against decoherence in fibers, crucial in long distance communication. Here, we demonstrate the direc...


    [Phys. Rev. Lett. 123, 030501] Published Mon Jul 15, 2019
  • Coherence and Asymmetry Cannot be Broadcast by Matteo Lostaglio and Markus P. Müller (2019/07/12 12:00)
    Author(s): Matteo Lostaglio and Markus P. Müller

    In the presence of conservation laws, superpositions of eigenstates of the corresponding conserved quantities cannot be generated by quantum dynamics. Thus, any such coherence represents a potentially valuable resource of asymmetry, which can be used, for example, to enhance the precision of quantum...


    [Phys. Rev. Lett. 123, 020403] Published Fri Jul 12, 2019
  • Loop Corrections in Spin Models through Density Consistency by Alfredo Braunstein, Giovanni Catania, and Luca Dall’Asta (2019/07/12 12:00)
    Author(s): Alfredo Braunstein, Giovanni Catania, and Luca Dall’Asta

    Computing marginal distributions of discrete or semidiscrete Markov random fields (MRFs) is a fundamental, generally intractable problem with a vast number of applications in virtually all fields of science. We present a new family of computational schemes to approximately calculate the marginals of...


    [Phys. Rev. Lett. 123, 020604] Published Fri Jul 12, 2019
  • Can Three-Body Recombination Purify a Quantum Gas? by Lena H. Dogra, Jake A. P. Glidden, Timon A. Hilker, Christoph Eigen, Eric A. Cornell, Robert P. Smith, and Zoran Hadzibabic (2019/07/12 12:00)
    Author(s): Lena H. Dogra, Jake A. P. Glidden, Timon A. Hilker, Christoph Eigen, Eric A. Cornell, Robert P. Smith, and Zoran Hadzibabic

    Three-body recombination in a cold Bose gas reduces entropy, providing a novel way to cool the gas efficiently.


    [Phys. Rev. Lett. 123, 020405] Published Fri Jul 12, 2019
  • No-Broadcasting Theorem for Quantum Asymmetry and Coherence and a Trade-off Relation for Approximate Broadcasting by Iman Marvian and Robert W. Spekkens (2019/07/12 12:00)
    Author(s): Iman Marvian and Robert W. Spekkens

    Symmetries of both closed- and open-system dynamics imply many significant constraints. These generally have instantiations in both classical and quantum dynamics (Noether’s theorem, for instance, applies to both sorts of dynamics). We here provide an example of such a constraint which has no counte...


    [Phys. Rev. Lett. 123, 020404] Published Fri Jul 12, 2019
  • Energy Current Rectification and Mobility Edges by Vinitha Balachandran, Stephen R. Clark, John Goold, and Dario Poletti (2019/07/10 12:00)
    Author(s): Vinitha Balachandran, Stephen R. Clark, John Goold, and Dario Poletti

    We investigate how the presence of a single-particle mobility edge in a system can generate strong energy current rectification. Specifically, we study a quadratic bosonic chain subject to a quasiperiodic potential and coupled at its boundaries to spin baths of differing temperature. We find that re...


    [Phys. Rev. Lett. 123, 020603] Published Wed Jul 10, 2019
  • Quantum Hypercube States by L. A. Howard, T. J. Weinhold, F. Shahandeh, J. Combes, M. R. Vanner, A. G. White, and M. Ringbauer (2019/07/10 12:00)
    Author(s): L. A. Howard, T. J. Weinhold, F. Shahandeh, J. Combes, M. R. Vanner, A. G. White, and M. Ringbauer

    We introduce quantum hypercube states, a class of continuous-variable quantum states that are generated as orthographic projections of hypercubes onto the quadrature phase space of a bosonic mode. In addition to their interesting geometry, hypercube states display phase-space features much smaller t...


    [Phys. Rev. Lett. 123, 020402] Published Wed Jul 10, 2019
  • When Random Walkers Help Solving Intriguing Integrals by Satya N. Majumdar and Emmanuel Trizac (2019/07/10 12:00)
    Author(s): Satya N. Majumdar and Emmanuel Trizac

    We revisit a family of integrals that delude intuition and that recently appeared in mathematical literature in connection with computer algebra package verification. We show that the remarkable properties displayed by these integrals become transparent when formulated in the language of random walk...


    [Phys. Rev. Lett. 123, 020201] Published Wed Jul 10, 2019
  • Multiple Exclusion Statistics by Julian J. Riccardo, Jose L. Riccardo, Antonio J. Ramirez-Pastor, and Pedro M. Pasinetti (2019/07/10 12:00)
    Author(s): Julian J. Riccardo, Jose L. Riccardo, Antonio J. Ramirez-Pastor, and Pedro M. Pasinetti

    A new distribution for systems of particles in equilibrium obeying the exclusion of correlated states is presented following Haldane’s state counting. It relies upon an ansatz to deal with the multiple exclusion that takes place when the states accessible to single particles are spatially correlated...


    [Phys. Rev. Lett. 123, 020602] Published Wed Jul 10, 2019
  • One-Shot Operational Quantum Resource Theory by Zi-Wen Liu, Kaifeng Bu, and Ryuji Takagi (2019/07/09 12:00)
    Author(s): Zi-Wen Liu, Kaifeng Bu, and Ryuji Takagi

    A wide class of resource theories are considered for the practical case where one has only one or a few copies of the quantum state.


    [Phys. Rev. Lett. 123, 020401] Published Tue Jul 09, 2019
  • Characterizing a Statistical Arrow of Time in Quantum Measurement Dynamics by P. M. Harrington, D. Tan, M. Naghiloo, and K. W. Murch (2019/07/09 12:00)
    Author(s): P. M. Harrington, D. Tan, M. Naghiloo, and K. W. Murch

    In both thermodynamics and quantum mechanics, the arrow of time is characterized by the statistical likelihood of physical processes. We characterize this arrow of time for the continuous quantum measurement dynamics of a superconducting qubit. By experimentally tracking individual weak measurement ...


    [Phys. Rev. Lett. 123, 020502] Published Tue Jul 09, 2019
  • Topologically Protected Quantization of Work by Bruno Mera, Krzysztof Sacha, and Yasser Omar (2019/07/09 12:00)
    Author(s): Bruno Mera, Krzysztof Sacha, and Yasser Omar

    Using ideas from topological materials, researchers propose a way to quantize work.


    [Phys. Rev. Lett. 123, 020601] Published Tue Jul 09, 2019
  • Cellular-Automaton Decoders with Provable Thresholds for Topological Codes by Aleksander Kubica and John Preskill (2019/07/08 12:00)
    Author(s): Aleksander Kubica and John Preskill

    We propose a new cellular automaton (CA), the sweep rule, which generalizes Toom’s rule to any locally Euclidean lattice. We use the sweep rule to design a local decoder for the toric code in $d≥3$ dimensions, the sweep decoder, and rigorously establish a lower bound on its performance. We also nume...


    [Phys. Rev. Lett. 123, 020501] Published Mon Jul 08, 2019
  • Universal Uhrig Dynamical Decoupling for Bosonic Systems by Margret Heinze and Robert König (2019/07/03 12:00)
    Author(s): Margret Heinze and Robert König

    We construct efficient deterministic dynamical decoupling schemes protecting continuous-variable degrees of freedom. Our schemes target decoherence induced by quadratic system-bath interactions with analytic time dependence. We show how to suppress such interactions to $N$th order using only $N$ pul...


    [Phys. Rev. Lett. 123, 010501] Published Wed Jul 03, 2019
  • Finite-Size Scaling of Out-of-Time-Ordered Correlators at Late Times by Yichen Huang (黄溢辰), Fernando G. S. L. Brandão, and Yong-Liang Zhang (张涌良) (2019/07/01 12:00)
    Author(s): Yichen Huang (黄溢辰), Fernando G. S. L. Brandão, and Yong-Liang Zhang (张涌良)

    Chaotic dynamics in quantum many-body systems scrambles local information so that at late times it can no longer be accessed locally. This is reflected quantitatively in the out-of-time-ordered correlator of local operators, which is expected to decay to 0 with time. However, for systems of finite s...


    [Phys. Rev. Lett. 123, 010601] Published Mon Jul 01, 2019
  • Neural-Network Approach to Dissipative Quantum Many-Body Dynamics by Michael J. Hartmann and Giuseppe Carleo (2019/06/28 12:00)
    Author(s): Michael J. Hartmann and Giuseppe Carleo

    Simulating a quantum system that exchanges energy with the outside world is notoriously hard, but the necessary computations might be easier with the help of neural networks.


    [Phys. Rev. Lett. 122, 250502] Published Fri Jun 28, 2019
  • Operator Entanglement in Interacting Integrable Quantum Systems: The Case of the Rule 54 Chain by V. Alba, J. Dubail, and M. Medenjak (2019/06/28 12:00)
    Author(s): V. Alba, J. Dubail, and M. Medenjak

    In a many-body quantum system, local operators in the Heisenberg picture $O(t)={e}^{iHt}O{e}^{−iHt}$ spread as time increases. Recent studies have attempted to find features of that spreading which could distinguish between chaotic and integrable dynamics. The operator entanglement—the entanglement ...


    [Phys. Rev. Lett. 122, 250603] Published Fri Jun 28, 2019
  • How to Compute Spectra with Error Control by Matthew J. Colbrook, Bogdan Roman, and Anders C. Hansen (2019/06/28 12:00)
    Author(s): Matthew J. Colbrook, Bogdan Roman, and Anders C. Hansen

    Computing the spectra of operators is a fundamental problem in the sciences, with wide-ranging applications in condensed-matter physics, quantum mechanics and chemistry, statistical mechanics, etc. While there are algorithms that in certain cases converge to the spectrum, no general procedure is kno...


    [Phys. Rev. Lett. 122, 250201] Published Fri Jun 28, 2019
  • Variational Neural-Network Ansatz for Steady States in Open Quantum Systems by Filippo Vicentini, Alberto Biella, Nicolas Regnault, and Cristiano Ciuti (2019/06/28 12:00)
    Author(s): Filippo Vicentini, Alberto Biella, Nicolas Regnault, and Cristiano Ciuti

    Simulating a quantum system that exchanges energy with the outside world is notoriously hard, but the necessary computations might be easier with the help of neural networks.


    [Phys. Rev. Lett. 122, 250503] Published Fri Jun 28, 2019
  • Variational Quantum Monte Carlo Method with a Neural-Network Ansatz for Open Quantum Systems by Alexandra Nagy and Vincenzo Savona (2019/06/28 12:00)
    Author(s): Alexandra Nagy and Vincenzo Savona

    Simulating a quantum system that exchanges energy with the outside world is notoriously hard, but the necessary computations might be easier with the help of neural networks.


    [Phys. Rev. Lett. 122, 250501] Published Fri Jun 28, 2019
  • Electric Rydberg-Atom Interferometry by J. E. Palmer and S. D. Hogan (2019/06/27 12:00)
    Author(s): J. E. Palmer and S. D. Hogan

    An electric analogue of the longitudinal Stern-Gerlach matter-wave interferometer has been realized for atoms in Rydberg states with high principal quantum number $n$. The experiments were performed with He atoms prepared in coherent superpositions of the $n=55$ and $n=56$ circular Rydberg states in...


    [Phys. Rev. Lett. 122, 250404] Published Thu Jun 27, 2019
  • Shortcut to Equilibration of an Open Quantum System by Roie Dann, Ander Tobalina, and Ronnie Kosloff (2019/06/26 12:00)
    Author(s): Roie Dann, Ander Tobalina, and Ronnie Kosloff

    We present a procedure to accelerate the relaxation of an open quantum system towards its equilibrium state. The control protocol, termed the shortcut to equilibration, is obtained by reverse-engineering the nonadiabatic master equation. This is a nonunitary control task aimed at rapidly changing th...


    [Phys. Rev. Lett. 122, 250402] Published Wed Jun 26, 2019
  • Robust Self-Testing of Quantum Systems via Noncontextuality Inequalities by Kishor Bharti, Maharshi Ray, Antonios Varvitsiotis, Naqueeb Ahmad Warsi, Adán Cabello, and Leong-Chuan Kwek (2019/06/26 12:00)
    Author(s): Kishor Bharti, Maharshi Ray, Antonios Varvitsiotis, Naqueeb Ahmad Warsi, Adán Cabello, and Leong-Chuan Kwek

    Characterizing unknown quantum states and measurements is a fundamental problem in quantum information processing. In this Letter, we provide a novel scheme to self-test local quantum systems using noncontextuality inequalities. Our work leverages the graph-theoretic framework for contextuality intr...


    [Phys. Rev. Lett. 122, 250403] Published Wed Jun 26, 2019
  • Sub-ballistic Growth of Rényi Entropies due to Diffusion by Tibor Rakovszky, Frank Pollmann, and C. W. von Keyserlingk (2019/06/25 12:00)
    Author(s): Tibor Rakovszky, Frank Pollmann, and C. W. von Keyserlingk

    Higher order Rényi entropies are sensitive to physics not captured by the von Neumann entropy, in particular they work for systems with locally conserved quantities that diffuse as a consequence of quantum fluctuations.


    [Phys. Rev. Lett. 122, 250602] Published Tue Jun 25, 2019
  • Dynamical Topological Quantum Phase Transitions in Nonintegrable Models by I. Hagymási, C. Hubig, Ö. Legeza, and U. Schollwöck (2019/06/25 12:00)
    Author(s): I. Hagymási, C. Hubig, Ö. Legeza, and U. Schollwöck

    We consider sudden quenches across quantum phase transitions in the $S=1$ $XXZ$ model starting from the Haldane phase. We demonstrate that dynamical phase transitions may occur during these quenches that are identified by nonanalyticities in the rate function for the return probability. In addition,...


    [Phys. Rev. Lett. 122, 250601] Published Tue Jun 25, 2019
  • Dynamical Quantum Phase Transitions in U(1) Quantum Link Models by Yi-Ping Huang, Debasish Banerjee, and Markus Heyl (2019/06/25 12:00)
    Author(s): Yi-Ping Huang, Debasish Banerjee, and Markus Heyl

    Quantum link models (QLMs) are extensions of Wilson-type lattice gauge theories which realize exact gauge invariance with finite-dimensional Hilbert spaces. QLMs not only reproduce standard features of Wilson lattice gauge theories in equilibrium, but can also host new phenomena such as crystalline ...


    [Phys. Rev. Lett. 122, 250401] Published Tue Jun 25, 2019
  • Work Distributions on Quantum Fields by Alvaro Ortega, Emma McKay, Álvaro M. Alhambra, and Eduardo Martín-Martínez (2019/06/21 12:00)
    Author(s): Alvaro Ortega, Emma McKay, Álvaro M. Alhambra, and Eduardo Martín-Martínez

    We study the work cost of processes in quantum fields without the need of projective measurements, which are always ill defined in quantum field theory. Inspired by interferometry schemes, we propose a work distribution that generalizes the two-point measurement scheme employed in quantum thermodyna...


    [Phys. Rev. Lett. 122, 240604] Published Fri Jun 21, 2019
  • Topologically Protected Long Edge Coherence Times in Symmetry-Broken Phases by Daniel E. Parker, Romain Vasseur, and Thomas Scaffidi (2019/06/21 12:00)
    Author(s): Daniel E. Parker, Romain Vasseur, and Thomas Scaffidi

    We argue that symmetry-broken phases proximate in phase space to symmetry-protected topological phases can exhibit dynamical signatures of topological physics. This dynamical, symmetry-protected “topological” regime is characterized by anomalously long edge coherence times due to the topological dec...


    [Phys. Rev. Lett. 122, 240605] Published Fri Jun 21, 2019
  • Integrability-Protected Adiabatic Reversibility in Quantum Spin Chains by Alvise Bastianello and Andrea De Luca (2019/06/21 12:00)
    Author(s): Alvise Bastianello and Andrea De Luca

    We consider the out-of-equilibrium dynamics of the Heisenberg anisotropic quantum spin-$1/2$ chain threaded by a time-dependent magnetic flux. In the spirit of the recently developed generalized hydrodynamics (GHD), we exploit the integrability of the model for any flux values to derive an exact des...


    [Phys. Rev. Lett. 122, 240606] Published Fri Jun 21, 2019
  • Evidence for Supersymmetry in the Random-Field Ising Model at $D=5$ by Nikolaos G. Fytas, Víctor Martín-Mayor, Giorgio Parisi, Marco Picco, and Nicolas Sourlas (2019/06/20 12:00)
    Author(s): Nikolaos G. Fytas, Víctor Martín-Mayor, Giorgio Parisi, Marco Picco, and Nicolas Sourlas

    We provide a nontrivial test of supersymmetry in the random-field Ising model at five spatial dimensions, by means of extensive zero-temperature numerical simulations. Indeed, supersymmetry relates correlation functions in a $D$-dimensional disordered system with some other correlation functions in ...


    [Phys. Rev. Lett. 122, 240603] Published Thu Jun 20, 2019
  • Many-Body Localization in the Presence of a Central Qudit by Nathan Ng and Michael Kolodrubetz (2019/06/19 12:00)
    Author(s): Nathan Ng and Michael Kolodrubetz

    We consider a many-body localized system coupled globally to a central $d$-level system. Under an appropriate scaling of $d$ and $L$, we find evidence that the localized phase survives. We argue for two possible thermalizing phases, depending on whether the qudit becomes fully ergodic. This system p...


    [Phys. Rev. Lett. 122, 240402] Published Wed Jun 19, 2019
  • Anonymity for Practical Quantum Networks by Anupama Unnikrishnan, Ian J. MacFarlane, Richard Yi, Eleni Diamanti, Damian Markham, and Iordanis Kerenidis (2019/06/19 12:00)
    Author(s): Anupama Unnikrishnan, Ian J. MacFarlane, Richard Yi, Eleni Diamanti, Damian Markham, and Iordanis Kerenidis

    Quantum communication networks have the potential to revolutionize information and communication technologies. Here we are interested in a fundamental property and formidable challenge for any communication network, that of guaranteeing the anonymity of a sender and a receiver when a message is tran...


    [Phys. Rev. Lett. 122, 240501] Published Wed Jun 19, 2019
  • Efficiency of a Quantum Otto Heat Engine Operating under a Reservoir at Effective Negative Temperatures by Rogério J. de Assis, Taysa M. de Mendonça, Celso J. Villas-Boas, Alexandre M. de Souza, Roberto S. Sarthour, Ivan S. Oliveira, and Norton G. de Almeida (2019/06/19 12:00)
    Author(s): Rogério J. de Assis, Taysa M. de Mendonça, Celso J. Villas-Boas, Alexandre M. de Souza, Roberto S. Sarthour, Ivan S. Oliveira, and Norton G. de Almeida

    We perform an experiment in which a quantum heat engine works under two reservoirs, one at a positive spin temperature and the other at an effective negative spin temperature, i.e., when the spin system presents population inversion. We show that the efficiency of this engine can be greater than tha...


    [Phys. Rev. Lett. 122, 240602] Published Wed Jun 19, 2019
  • Geometry of Einstein-Podolsky-Rosen Correlations by H. Chau Nguyen, Huy-Viet Nguyen, and Otfried Gühne (2019/06/17 12:00)
    Author(s): H. Chau Nguyen, Huy-Viet Nguyen, and Otfried Gühne

    Correlations between distant particles are central to many puzzles and paradoxes of quantum mechanics and, at the same time, underpin various applications such as quantum cryptography and metrology. Originally in 1935, Einstein, Podolsky, and Rosen (EPR) used these correlations to argue against the ...


    [Phys. Rev. Lett. 122, 240401] Published Mon Jun 17, 2019
  • Partial Fermionization: Spectral Universality in 1D Repulsive Bose Gases by Quirin Hummel, Juan Diego Urbina, and Klaus Richter (2019/06/17 12:00)
    Author(s): Quirin Hummel, Juan Diego Urbina, and Klaus Richter

    Because of the vast growth of the many-body level density with excitation energy, its smoothed form is of central relevance for spectral and thermodynamic properties of interacting quantum systems. We compute the cumulative of this level density for confined one-dimensional continuous systems with r...


    [Phys. Rev. Lett. 122, 240601] Published Mon Jun 17, 2019
  • Universal First-Passage-Time Distribution of Non-Gaussian Currents by Shilpi Singh, Paul Menczel, Dmitry S. Golubev, Ivan M. Khaymovich, Joonas T. Peltonen, Christian Flindt, Keiji Saito, Édgar Roldán, and Jukka P. Pekola (2019/06/13 12:00)
    Author(s): Shilpi Singh, Paul Menczel, Dmitry S. Golubev, Ivan M. Khaymovich, Joonas T. Peltonen, Christian Flindt, Keiji Saito, Édgar Roldán, and Jukka P. Pekola

    We investigate the fluctuations of the time elapsed until the electric charge transferred through a conductor reaches a given threshold value. For this purpose, we measure the distribution of the first-passage times for the net number of electrons transferred between two metallic islands in the Coul...


    [Phys. Rev. Lett. 122, 230602] Published Thu Jun 13, 2019
  • Dynamical Fractal in Quantum Gases with Discrete Scaling Symmetry by Chao Gao, Hui Zhai, and Zhe-Yu Shi (2019/06/12 12:00)
    Author(s): Chao Gao, Hui Zhai, and Zhe-Yu Shi

    Inspired by the similarity between the fractal Weierstrass function and quantum systems with discrete scaling symmetry, we establish general conditions under which the dynamics of a quantum system will exhibit fractal structure in the time domain. As an example, we discuss the dynamics of the Loschm...


    [Phys. Rev. Lett. 122, 230402] Published Wed Jun 12, 2019
  • Quantum Computation of Electronic Transitions Using a Variational Quantum Eigensolver by Robert M. Parrish, Edward G. Hohenstein, Peter L. McMahon, and Todd J. Martínez (2019/06/12 12:00)
    Author(s): Robert M. Parrish, Edward G. Hohenstein, Peter L. McMahon, and Todd J. Martínez

    We develop an extension of the variational quantum eigensolver (VQE) algorithm—multistate contracted VQE (MC-VQE)—that allows for the efficient computation of the transition energies between the ground state and several low-lying excited states of a molecule, as well as the oscillator strengths asso...


    [Phys. Rev. Lett. 122, 230401] Published Wed Jun 12, 2019
  • Operationally Accessible Bounds on Fluctuations and Entropy Production in Periodically Driven Systems by Timur Koyuk and Udo Seifert (2019/06/11 12:00)
    Author(s): Timur Koyuk and Udo Seifert

    For periodically driven systems, we derive a family of inequalities that relate entropy production with experimentally accessible data for the mean, its dependence on driving frequency, and the variance of a large class of observables. With one of these relations, overall entropy production can be b...


    [Phys. Rev. Lett. 122, 230601] Published Tue Jun 11, 2019
  • Higher-Dimensional Quantum Hypergraph-Product Codes with Finite Rates by Weilei Zeng and Leonid P. Pryadko (2019/06/11 12:00)
    Author(s): Weilei Zeng and Leonid P. Pryadko

    We describe a family of quantum error-correcting codes which generalize both the quantum hypergraph-product codes by Tillich and Zémor and all families of toric codes on $m$-dimensional hypercubic lattices. Parameters of the constructed codes, including the minimum distances, are given explicitly in...


    [Phys. Rev. Lett. 122, 230501] Published Tue Jun 11, 2019
  • Eigenstate Correlations, Thermalization, and the Butterfly Effect by Amos Chan, Andrea De Luca, and J. T. Chalker (2019/06/07 12:00)
    Author(s): Amos Chan, Andrea De Luca, and J. T. Chalker

    We discuss eigenstate correlations for ergodic, spatially extended many-body quantum systems, in terms of the statistical properties of matrix elements of local observables. While the eigenstate thermalization hypothesis (ETH) is known to give an excellent description of these quantities, the phenom...


    [Phys. Rev. Lett. 122, 220601] Published Fri Jun 07, 2019
  • Novel Technique for Robust Optimal Algorithmic Cooling by Sadegh Raeisi, Mária Kieferová, and Michele Mosca (2019/06/07 12:00)
    Author(s): Sadegh Raeisi, Mária Kieferová, and Michele Mosca

    Heat-bath algorithmic cooling provides algorithmic ways to improve the purity of quantum states. These techniques are complex iterative processes that change from each iteration to the next and this poses a significant challenge to implementing these algorithms. Here, we introduce a new technique th...


    [Phys. Rev. Lett. 122, 220501] Published Fri Jun 07, 2019
  • Emergent SU(2) Dynamics and Perfect Quantum Many-Body Scars by Soonwon Choi, Christopher J. Turner, Hannes Pichler, Wen Wei Ho, Alexios A. Michailidis, Zlatko Papić, Maksym Serbyn, Mikhail D. Lukin, and Dmitry A. Abanin (2019/06/07 12:00)
    Author(s): Soonwon Choi, Christopher J. Turner, Hannes Pichler, Wen Wei Ho, Alexios A. Michailidis, Zlatko Papić, Maksym Serbyn, Mikhail D. Lukin, and Dmitry A. Abanin

    Long-lived dynamics in a constrained spin model suggests that quantum scars are stable in the thermodynamic limit.


    [Phys. Rev. Lett. 122, 220603] Published Fri Jun 07, 2019
  • Quantum Martingale Theory and Entropy Production by Gonzalo Manzano, Rosario Fazio, and Édgar Roldán (2019/06/07 12:00)
    Author(s): Gonzalo Manzano, Rosario Fazio, and Édgar Roldán

    We employ martingale theory to describe fluctuations of entropy production for open quantum systems in nonequilbrium steady states. Using the formalism of quantum jump trajectories, we identify a decomposition of entropy production into an exponential martingale and a purely quantum term, both obeyi...


    [Phys. Rev. Lett. 122, 220602] Published Fri Jun 07, 2019
  • Entanglement Detection by Violations of Noisy Uncertainty Relations: A Proof of Principle by Yuan-Yuan Zhao, Guo-Yong Xiang, Xiao-Min Hu, Bi-Heng Liu, Chuan-Feng Li, Guang-Can Guo, René Schwonnek, and Ramona Wolf (2019/06/07 12:00)
    Author(s): Yuan-Yuan Zhao, Guo-Yong Xiang, Xiao-Min Hu, Bi-Heng Liu, Chuan-Feng Li, Guang-Can Guo, René Schwonnek, and Ramona Wolf

    It is well known that the violation of a local uncertainty relation can be used as an indicator for the presence of entanglement. Unfortunately, the practical use of these nonlinear witnesses has been limited to few special cases in the past. However, new methods for computing uncertainty bounds hav...


    [Phys. Rev. Lett. 122, 220401] Published Fri Jun 07, 2019
  • Machine Learning Topological Phases with a Solid-State Quantum Simulator by Wenqian Lian, Sheng-Tao Wang, Sirui Lu, Yuanyuan Huang, Fei Wang, Xinxing Yuan, Wengang Zhang, Xiaolong Ouyang, Xin Wang, Xianzhi Huang, Li He, Xiuying Chang, Dong-Ling Deng, and Luming Duan (2019/05/31 12:00)
    Author(s): Wenqian Lian, Sheng-Tao Wang, Sirui Lu, Yuanyuan Huang, Fei Wang, Xinxing Yuan, Wengang Zhang, Xiaolong Ouyang, Xin Wang, Xianzhi Huang, Li He, Xiuying Chang, Dong-Ling Deng, and Luming Duan

    We report an experimental demonstration of a machine learning approach to identify exotic topological phases, with a focus on the three-dimensional chiral topological insulators. We show that the convolutional neural networks—a class of deep feed-forward artificial neural networks with widespread ap...


    [Phys. Rev. Lett. 122, 210503] Published Fri May 31, 2019
  • Kardar-Parisi-Zhang Physics in the Quantum Heisenberg Magnet by Marko Ljubotina, Marko Žnidarič, and Tomaž Prosen (2019/05/31 12:00)
    Author(s): Marko Ljubotina, Marko Žnidarič, and Tomaž Prosen

    Equilibrium spatiotemporal correlation functions are central to understanding weak nonequilibrium physics. In certain local one-dimensional classical systems with three conservation laws they show universal features. Namely, fluctuations around ballistically propagating sound modes can be described ...


    [Phys. Rev. Lett. 122, 210602] Published Fri May 31, 2019
  • Dissipative Charging of a Quantum Battery by Felipe Barra (2019/05/30 12:00)
    Author(s): Felipe Barra

    We show that a cyclic unitary process can extract work from the thermodynamic equilibrium state of an engineered quantum dissipative process. Systems in the equilibrium states of these processes serve as batteries, storing energy. The dissipative process that brings the battery to the active equilib...


    [Phys. Rev. Lett. 122, 210601] Published Thu May 30, 2019
  • Sample Complexity of Device-Independently Certified “Quantum Supremacy” by Dominik Hangleiter, Martin Kliesch, Jens Eisert, and Christian Gogolin (2019/05/29 12:00)
    Author(s): Dominik Hangleiter, Martin Kliesch, Jens Eisert, and Christian Gogolin

    Results on the hardness of approximate sampling are seen as important stepping stones toward a convincing demonstration of the superior computational power of quantum devices. The most prominent suggestions for such experiments include boson sampling, instantaneous quantum polynomial time (IQP) circ...


    [Phys. Rev. Lett. 122, 210502] Published Wed May 29, 2019
  • Quantum Storage of Single-Photon and Two-Photon Fock States with an All-Optical Quantum Memory by M. Bouillard, G. Boucher, J. Ferrer Ortas, B. Pointard, and R. Tualle-Brouri (2019/05/29 12:00)
    Author(s): M. Bouillard, G. Boucher, J. Ferrer Ortas, B. Pointard, and R. Tualle-Brouri

    Quantum memories are a crucial element toward efficient quantum protocols. In the continuous variables domain, such memories need to provide high fidelity with an efficiency set to one. Moreover, one needs to store complex quantum states exhibiting negative Wigner functions after storage. We report ...


    [Phys. Rev. Lett. 122, 210501] Published Wed May 29, 2019
  • Experimental Measurement of the Quantum Metric Tensor and Related Topological Phase Transition with a Superconducting Qubit by Xinsheng Tan, Dan-Wei Zhang, Zhen Yang, Ji Chu, Yan-Qing Zhu, Danyu Li, Xiaopei Yang, Shuqing Song, Zhikun Han, Zhiyuan Li, Yuqian Dong, Hai-Feng Yu, Hui Yan, Shi-Liang Zhu, and Yang Yu (2019/05/29 12:00)
    Author(s): Xinsheng Tan, Dan-Wei Zhang, Zhen Yang, Ji Chu, Yan-Qing Zhu, Danyu Li, Xiaopei Yang, Shuqing Song, Zhikun Han, Zhiyuan Li, Yuqian Dong, Hai-Feng Yu, Hui Yan, Shi-Liang Zhu, and Yang Yu

    A Berry curvature is an imaginary component of the quantum geometric tensor (QGT) and is well studied in many branches of modern physics; however, the quantum metric as a real component of the QGT is less explored. Here, by using tunable superconducting circuits, we experimentally demonstrate two me...


    [Phys. Rev. Lett. 122, 210401] Published Wed May 29, 2019
  • Von Neumann Entropy from Unitarity by Paul Boes, Jens Eisert, Rodrigo Gallego, Markus P. Müller, and Henrik Wilming (2019/05/28 12:00)
    Author(s): Paul Boes, Jens Eisert, Rodrigo Gallego, Markus P. Müller, and Henrik Wilming

    The von Neumann entropy is a key quantity in quantum information theory and, roughly speaking, quantifies the amount of quantum information contained in a state when many identical and independent (i.i.d.) copies of the state are available, in a regime that is often referred to as being asymptotic. ...


    [Phys. Rev. Lett. 122, 210402] Published Tue May 28, 2019
  • Metric-Torsion Duality of Optically Chiral Structures by Yongliang Zhang, Lina Shi, Ruo-Yang Zhang, Jinglai Duan, Jack Ng, C. T. Chan, and Kin Hung Fung (2019/05/24 12:00)
    Author(s): Yongliang Zhang, Lina Shi, Ruo-Yang Zhang, Jinglai Duan, Jack Ng, C. T. Chan, and Kin Hung Fung

    We develop a metric-torsion theory for chiral structures by using a generalized framework of transformation optics. We show that the chirality is uniquely determined by a metric with the local rotational degree of freedom. In analogy to the dislocation continuum, the chirality can be alternatively i...


    [Phys. Rev. Lett. 122, 200201] Published Fri May 24, 2019
Physical Review E
  • Micro-, meso-, macroscales: The effect of triangles on communities in networks by Sophie Wharrie, Lamiae Azizi, and Eduardo G. Altmann (2019/08/21 12:00)
    Author(s): Sophie Wharrie, Lamiae Azizi, and Eduardo G. Altmann

    Mesoscale structures (communities) are used to understand the macroscale properties of complex networks, such as their functionality and formation mechanisms. Microscale structures are known to exist in most complex networks (e.g., large number of triangles or motifs), but they are absent in the sim...


    [Phys. Rev. E 100, 022315] Published Wed Aug 21, 2019
  • Persistent homology of complex networks for dynamic state detection by Audun Myers, Elizabeth Munch, and Firas A. Khasawneh (2019/08/21 12:00)
    Author(s): Audun Myers, Elizabeth Munch, and Firas A. Khasawneh

    In this paper we develop an alternative topological data analysis (TDA) approach for studying graph representations of time series of dynamical systems. Specifically, we show how persistent homology, a tool from TDA, can be used to yield a compressed, multi-scale representation of the graph that can...


    [Phys. Rev. E 100, 022314] Published Wed Aug 21, 2019
  • Control of coherence resonance by self-induced stochastic resonance in a multiplex neural network by Marius E. Yamakou and Jürgen Jost (2019/08/20 12:00)
    Author(s): Marius E. Yamakou and Jürgen Jost

    We consider a two-layer multiplex network of diffusively coupled FitzHugh-Nagumo (FHN) neurons in the excitable regime. We show that the phenomenon of coherence resonance (CR) in one layer can not only be controlled by the network topology, the intra- and interlayer time-delayed couplings, but also ...


    [Phys. Rev. E 100, 022313] Published Tue Aug 20, 2019
  • Aging in transport processes on networks with stochastic cumulative damage by A. P. Riascos, J. Wang-Michelitsch, and T. M. Michelitsch (2019/08/20 12:00)
    Author(s): A. P. Riascos, J. Wang-Michelitsch, and T. M. Michelitsch

    In this paper we explore the evolution of transport capacity on networks with stochastic incidence of damage and accumulation of faults in their connections. For each damaged configuration of the network, we analyze a Markovian random walker that hops over weighted links that quantify the capacity o...


    [Phys. Rev. E 100, 022312] Published Tue Aug 20, 2019
  • Walking on stairs: Experiment and model by Gerta Köster, Daniel Lehmberg, and Angelika Kneidl (2019/08/19 12:00)
    Author(s): Gerta Köster, Daniel Lehmberg, and Angelika Kneidl

    An increasing global population forces urban planners to construct buildings and infrastructure that is extremely deep and high. Elevators and escalators serve skyscrapers and tunnels, but in an emergency people still have to walk on stairs. Computer simulations can mitigate risks of escape situatio...


    [Phys. Rev. E 100, 022310] Published Mon Aug 19, 2019
  • Relational flexibility of network elements based on inconsistent community detection by Heetae Kim (김희태) and Sang Hoon Lee (이상훈) (2019/08/19 12:00)
    Author(s): Heetae Kim (김희태) and Sang Hoon Lee (이상훈)

    Community identification of network components enables us to understand the mesoscale clustering structure of networks. A number of algorithms have been developed to determine the most likely community structures in networks. Such a probabilistic or stochastic nature of this problem can naturally in...


    [Phys. Rev. E 100, 022311] Published Mon Aug 19, 2019
  • Phase transition creates the geometry of the continuum from discrete space by Robert S. Farr and Thomas M. A. Fink (2019/08/16 12:00)
    Author(s): Robert S. Farr and Thomas M. A. Fink

    Models of discrete space and space-time that exhibit continuum-like behavior at large lengths could have profound implications for physics. They may help tame the infinities arising from quantizing gravity, and remove the need for the machinery of the real numbers; a construct with no direct observa...


    [Phys. Rev. E 100, 022308] Published Fri Aug 16, 2019
  • Dynamic behavior analysis of an internet flow interaction model under cascading failures by Xiaoyu Wu, Rentao Gu, Yuefeng Ji, and H. Eugene Stanley (2019/08/16 12:00)
    Author(s): Xiaoyu Wu, Rentao Gu, Yuefeng Ji, and H. Eugene Stanley

    Cascading failures in the internet have attracted recent attention due to their unpredictability and destructive consequences. Exploring the failure behavior patterns is necessary because they can provide effective intervention approaches to prevent huge network disasters. To analyze internet flow b...


    [Phys. Rev. E 100, 022309] Published Fri Aug 16, 2019
  • Enhancing the robustness of a multiplex network leads to multiple discontinuous percolation transitions by Ivan Kryven and Ginestra Bianconi (2019/08/15 12:00)
    Author(s): Ivan Kryven and Ginestra Bianconi

    Determining design principles that boost the robustness of interdependent networks is a fundamental question of engineering, economics, and biology. It is known that maximizing the degree correlation between replicas of the same node leads to optimal robustness. Here we show that increased robustnes...


    [Phys. Rev. E 100, 020301(R)] Published Thu Aug 15, 2019
  • Copula-based algorithm for generating bursty time series by Hang-Hyun Jo, Byoung-Hwa Lee, Takayuki Hiraoka, and Woo-Sung Jung (2019/08/14 12:00)
    Author(s): Hang-Hyun Jo, Byoung-Hwa Lee, Takayuki Hiraoka, and Woo-Sung Jung

    Dynamical processes in various natural and social phenomena have been described by a series of events or event sequences showing non-Poissonian, bursty temporal patterns. Temporal correlations in such bursty time series can be understood not only by heterogeneous interevent times (IETs) but also by ...


    [Phys. Rev. E 100, 022307] Published Wed Aug 14, 2019
  • Renormalization group for link percolation on planar hyperbolic manifolds by Ivan Kryven, Robert M. Ziff, and Ginestra Bianconi (2019/08/13 12:00)
    Author(s): Ivan Kryven, Robert M. Ziff, and Ginestra Bianconi

    Network geometry is currently a topic of growing scientific interest, as it opens the possibility to explore and interpret the interplay between structure and dynamics of complex networks using geometrical arguments. However, the field is still in its infancy. In this work we investigate the role of...


    [Phys. Rev. E 100, 022306] Published Tue Aug 13, 2019
  • Social reinforcement with weighted interactions by Théo Konc and Ivan Savin (2019/08/09 12:00)
    Author(s): Théo Konc and Ivan Savin

    The speed and extent of diffusion of behaviors in social networks depends on network structure and individual preferences. The contribution of the present study is twofold. First, we introduce weighted interactions between potential adopters that depend on the similarity in their preferences and mod...


    [Phys. Rev. E 100, 022305] Published Fri Aug 09, 2019
  • Consensus and diversity in multistate noisy voter models by Francisco Herrerías-Azcué and Tobias Galla (2019/08/06 12:00)
    Author(s): Francisco Herrerías-Azcué and Tobias Galla

    We study a variant of the voter model with multiple opinions; individuals can imitate each other and also change their opinion randomly in mutation events. We focus on the case of a population with all-to-all interaction. A noise-driven transition between regimes with multimodal and unimodal station...


    [Phys. Rev. E 100, 022304] Published Tue Aug 06, 2019
  • Intervention threshold for epidemic control in susceptible-infected-recovered metapopulation models by Akari Matsuki and Gouhei Tanaka (2019/08/05 12:00)
    Author(s): Akari Matsuki and Gouhei Tanaka

    Metapopulation epidemic models describe epidemic dynamics in networks of spatially distant patches connected via pathways for migration of individuals. In the present study, we deal with a susceptible-infected-recovered (SIR) metapopulation model where the epidemic process in each patch is represent...


    [Phys. Rev. E 100, 022302] Published Mon Aug 05, 2019
  • Phase transition in a network model of social balance with Glauber dynamics by Rana Shojaei, Pouya Manshour, and Afshin Montakhab (2019/08/05 12:00)
    Author(s): Rana Shojaei, Pouya Manshour, and Afshin Montakhab

    We study the evolution of a social network with friendly or enmity connections into a balanced state by introducing a dynamical model with an intrinsic randomness, similar to Glauber dynamics in statistical mechanics. We include the possibility of the tension promotion as well as the tension reducti...


    [Phys. Rev. E 100, 022303] Published Mon Aug 05, 2019
  • Map equation with metadata: Varying the role of attributes in community detection by Scott Emmons and Peter J. Mucha (2019/08/02 12:00)
    Author(s): Scott Emmons and Peter J. Mucha

    Much of the community detection literature studies structural communities, communities defined solely by the connectivity patterns of the network. Often networks contain additional metadata which can inform community detection such as the grade and gender of students in a high school social network....


    [Phys. Rev. E 100, 022301] Published Fri Aug 02, 2019
  • Transitions from chimeras to coherence: An analytical approach by means of the coherent stability function by Sarbendu Rakshit, Zahra Faghani, Fatemeh Parastesh, Shirin Panahi, Sajad Jafari, Dibakar Ghosh, and Matjaž Perc (2019/07/30 12:00)
    Author(s): Sarbendu Rakshit, Zahra Faghani, Fatemeh Parastesh, Shirin Panahi, Sajad Jafari, Dibakar Ghosh, and Matjaž Perc

    Chimera states have been a vibrant subject of research in the recent past, but the analytical treatment of transitions from chimeras to coherent states remains a challenge. Here we analytically derive the necessary conditions for this transition by means of the coherent stability function approach, ...


    [Phys. Rev. E 100, 012315] Published Tue Jul 30, 2019
  • Cyberphysical risks of hacked internet-connected vehicles by Skanda Vivek, David Yanni, Peter J. Yunker, and Jesse L. Silverberg (2019/07/30 12:00)
    Author(s): Skanda Vivek, David Yanni, Peter J. Yunker, and Jesse L. Silverberg

    Researchers calculated the number of cars that hackers would have to bring down in order to cripple Manhattan traffic.


    [Phys. Rev. E 100, 012316] Published Tue Jul 30, 2019
  • Spectra of networks containing short loops by M. E. J. Newman (2019/07/26 12:00)
    Author(s): M. E. J. Newman

    The spectrum of the adjacency matrix plays several important roles in the mathematical theory of networks and network data analysis, for example in percolation theory, community detection, centrality measures, and the theory of dynamical systems on networks. A number of methods have been developed f...


    [Phys. Rev. E 100, 012314] Published Fri Jul 26, 2019
  • Effects of network robustness on explosive synchronization by Yang Liu and Jürgen Kurths (2019/07/25 12:00)
    Author(s): Yang Liu and Jürgen Kurths

    Current studies have shown that there is a positive correlation between the network assortativity and robustness and that the assortativity also plays an important role in explosive synchronization. In this paper, taking the network robustness as a global property, we investigate its significance as...


    [Phys. Rev. E 100, 012312] Published Thu Jul 25, 2019
  • Layer degradation triggers an abrupt structural transition in multiplex networks by Emanuele Cozzo, Guilherme Ferraz de Arruda, Francisco A. Rodrigues, and Yamir Moreno (2019/07/25 12:00)
    Author(s): Emanuele Cozzo, Guilherme Ferraz de Arruda, Francisco A. Rodrigues, and Yamir Moreno

    Network robustness is a central point in network science, both from a theoretical and a practical point of view. In this paper, we show that layer degradation, understood as the continuous or discrete loss of links' weight, triggers a structural transition revealed by an abrupt change in the algebra...


    [Phys. Rev. E 100, 012313] Published Thu Jul 25, 2019
  • Global benefit of randomness in individual routing on transportation networks by Tak Shing Tai and Chi Ho Yeung (2019/07/24 12:00)
    Author(s): Tak Shing Tai and Chi Ho Yeung

    By introducing a simple model based on two-dimensional cellular automata, we reveal the relationship between the routing strategies of individual vehicles and the global behavior of transportation networks. Specifically, we characterize the routing strategies by a single parameter called path-greedi...


    [Phys. Rev. E 100, 012311] Published Wed Jul 24, 2019
  • Effective traffic-flow assignment strategy on multilayer networks by Lei Gao, Panpan Shu, Ming Tang, Wei Wang, and Hui Gao (2019/07/23 12:00)
    Author(s): Lei Gao, Panpan Shu, Ming Tang, Wei Wang, and Hui Gao

    An efficient flow assignment strategy is of great importance to alleviate traffic congestion on multilayer networks. In this work, by considering the roles of nodes' local structures on the microlevel, and the different transporting speeds of layers in the macrolevel, an effective traffic-flow assig...


    [Phys. Rev. E 100, 012310] Published Tue Jul 23, 2019
  • Spectral properties of hyperbolic nanonetworks with tunable aggregation of simplexes by Marija Mitrović Dankulov, Bosiljka Tadić, and Roderick Melnik (2019/07/22 12:00)
    Author(s): Marija Mitrović Dankulov, Bosiljka Tadić, and Roderick Melnik

    Cooperative self-assembly is a ubiquitous phenomenon found in natural systems which is used for designing nanostructured materials with new functional features. Its origin and mechanisms, leading to improved functionality of the assembly, have attracted much attention from researchers in many branch...


    [Phys. Rev. E 100, 012309] Published Mon Jul 22, 2019
  • Multiple-interaction kinetic modeling of a virtual-item gambling economy by Giuseppe Toscani, Andrea Tosin, and Mattia Zanella (2019/07/19 12:00)
    Author(s): Giuseppe Toscani, Andrea Tosin, and Mattia Zanella

    In recent years, there has been a proliferation of online gambling sites, which has made gambling more accessible with a consequent rise in related problems, such as addiction. Hence, the analysis of the gambling behavior at both the individual and the aggregate levels has become the object of sever...


    [Phys. Rev. E 100, 012308] Published Fri Jul 19, 2019
  • Exact solution of generalized cooperative susceptible-infected-removed (SIR) dynamics by Fatemeh Zarei, Saman Moghimi-Araghi, and Fakhteh Ghanbarnejad (2019/07/18 12:00)
    Author(s): Fatemeh Zarei, Saman Moghimi-Araghi, and Fakhteh Ghanbarnejad

    In this paper, we introduce a general framework for coinfection as cooperative susceptible-infected-removed (SIR) dynamics. We first solve the SIR model analytically for two symmetric cooperative contagions [L. Chen et al., Europhys. Lett. 104, 50001 (2013)] and then generalize and solve the model ...


    [Phys. Rev. E 100, 012307] Published Thu Jul 18, 2019
  • Universal hypotrochoidic law for random matrices with cyclic correlations by Pau Vilimelis Aceituno, Tim Rogers, and Henning Schomerus (2019/07/16 12:00)
    Author(s): Pau Vilimelis Aceituno, Tim Rogers, and Henning Schomerus

    The celebrated elliptic law describes the distribution of eigenvalues of random matrices with correlations between off-diagonal pairs of elements, having applications to a wide range of physical and biological systems. Here, we investigate the generalization of this law to random matrices exhibiting...


    [Phys. Rev. E 100, 010302(R)] Published Tue Jul 16, 2019
  • Analytically solvable autocorrelation function for weakly correlated interevent times by Hang-Hyun Jo (2019/07/15 12:00)
    Author(s): Hang-Hyun Jo

    Long-term temporal correlations observed in event sequences of natural and social phenomena have been characterized by algebraically decaying autocorrelation functions. Such temporal correlations can be understood not only by heterogeneous interevent times (IETs) but also by correlations between IET...


    [Phys. Rev. E 100, 012306] Published Mon Jul 15, 2019
  • Condensation of degrees emerging through a first-order phase transition in classical random graphs by Fernando L. Metz and Isaac Pérez Castillo (2019/07/15 12:00)
    Author(s): Fernando L. Metz and Isaac Pérez Castillo

    Due to their conceptual and mathematical simplicity, Erdös-Rényi or classical random graphs remain as a fundamental paradigm to model complex interacting systems in several areas. Although condensation phenomena have been widely considered in complex network theory, the condensation of degrees has h...


    [Phys. Rev. E 100, 012305] Published Mon Jul 15, 2019
  • Real-space visualization of quantum phase transitions by network topology by Shehtab Zaman and Wei-Cheng Lee (2019/07/11 12:00)
    Author(s): Shehtab Zaman and Wei-Cheng Lee

    We demonstrate that with appropriate quantum correlation function, a real-space network model can be constructed to study the phase transitions in quantum systems. For a three-dimensional bosonic system, a single-particle density matrix is adopted to construct an adjacency matrix. We show that a Bos...


    [Phys. Rev. E 100, 012304] Published Thu Jul 11, 2019
  • Critical excitation-inhibition balance in dense neural networks by Lorenz Baumgarten and Stefan Bornholdt (2019/07/10 12:00)
    Author(s): Lorenz Baumgarten and Stefan Bornholdt

    The “edge of chaos” phase transition in artificial neural networks is of renewed interest in light of recent evidence for criticality in brain dynamics. Statistical mechanics traditionally studied this transition with connectivity $k$ as the control parameter and an exactly balanced excitation-inhib...


    [Phys. Rev. E 100, 010301(R)] Published Wed Jul 10, 2019
  • Statistical physics of synchronized traffic flow: Spatiotemporal competition between $S→F$ and $S→J$ instabilities by Boris S. Kerner (2019/07/09 12:00)
    Author(s): Boris S. Kerner

    We have revealed statistical physics of synchronized traffic flow that is governed by a spatiotemporal competition between $S→F$ and $S→J$ instabilities (where $F$, $S$, and $J$ denote, respectively, the free flow, synchronized flow, and wide moving jam traffic phases). A probabilistic analysis of s...


    [Phys. Rev. E 100, 012303] Published Tue Jul 09, 2019
  • Emergence of patterns in random processes. III. Clustering in higher dimensions by William I. Newman and Philip Lu (2019/07/08 12:00)
    Author(s): William I. Newman and Philip Lu

    Newman et al. [Phys. Rev. E 86, 026103 (2012)] showed that points uniformly distributed as independent and identically distributed random variables with nearest-neighbor interactions form clusters with a mean number of three points in each. Here, we extend our analysis to higher dimensions, ultimate...


    [Phys. Rev. E 100, 012302] Published Mon Jul 08, 2019
  • Refined parcellation of the nervous system by algorithmic detection of hidden features within communities by Dongmei Shi, Anna Levina, and Hamid R. Noori (2019/07/03 12:00)
    Author(s): Dongmei Shi, Anna Levina, and Hamid R. Noori

    The nervous system can be represented as a multiscale network comprised by single cells or ensembles that are linked by physical or functional connections. Groups of morphologically and physiologically diverse neurons are wired as connectivity patterns with a certain degree of universality across sp...


    [Phys. Rev. E 100, 012301] Published Wed Jul 03, 2019
  • Cooperation dynamics in networked geometric Brownian motion by Viktor Stojkoski, Zoran Utkovski, Lasko Basnarkov, and Ljupco Kocarev (2019/06/28 12:00)
    Author(s): Viktor Stojkoski, Zoran Utkovski, Lasko Basnarkov, and Ljupco Kocarev

    Recent works suggest that pooling and sharing may constitute a fundamental mechanism for the evolution of cooperation in well-mixed fluctuating environments. The rationale is that, by reducing the amplitude of fluctuations, pooling and sharing increases the steady-state growth rate at which individu...


    [Phys. Rev. E 99, 062312] Published Fri Jun 28, 2019
  • $Q$-Gaussian diffusion in stock markets by Fernando Alonso-Marroquin, Karina Arias-Calluari, Michael Harré, Morteza N. Najafi, and Hans J. Herrmann (2019/06/28 12:00)
    Author(s): Fernando Alonso-Marroquin, Karina Arias-Calluari, Michael Harré, Morteza N. Najafi, and Hans J. Herrmann

    We analyze the Standard Poor's 500 stock market index from the past 22 years. The probability density function of price returns exhibits two well-distinguished regimes with self-similar structure: the first one displays strong superdiffusion together with short-time correlations and the second one ...


    [Phys. Rev. E 99, 062313] Published Fri Jun 28, 2019
  • Explosive transitions induced by interdependent contagion-consensus dynamics in multiplex networks by D. Soriano-Paños, Q. Guo, V. Latora, and J. Gómez-Gardeñes (2019/06/25 12:00)
    Author(s): D. Soriano-Paños, Q. Guo, V. Latora, and J. Gómez-Gardeñes

    We introduce a model to study the interplay between information spreading and opinion formation in social systems. Our framework consists in a two-layer multiplex network where opinion dynamics takes place in one layer, while information spreads on the other one. The two dynamical processes are mutu...


    [Phys. Rev. E 99, 062311] Published Tue Jun 25, 2019
  • Correlations between communicability sequence entropy and transport performance in spatially embedded networks by Dan Chen, Rui-Wu Niu, and Gui-Jun Pan (2019/06/24 12:00)
    Author(s): Dan Chen, Rui-Wu Niu, and Gui-Jun Pan

    We investigate electric current transport performances in spatially embedded networks with total cost restriction introduced by Li et al. [Phys. Rev. Lett. 104, 018701 (2010)]. Precisely, the network is built from a $d$-dimensional regular lattice to be improved by adding long-range connections with...


    [Phys. Rev. E 99, 062310] Published Mon Jun 24, 2019
  • Market fragmentation and market consolidation: Multiple steady states in systems of adaptive traders choosing where to trade by Aleksandra Alorić and Peter Sollich (2019/06/21 12:00)
    Author(s): Aleksandra Alorić and Peter Sollich

    Technological progress is leading to proliferation and diversification of trading venues, thus increasing the relevance of the long-standing question of market fragmentation versus consolidation. To address this issue quantitatively, we analyze systems of adaptive traders that choose where to trade ...


    [Phys. Rev. E 99, 062309] Published Fri Jun 21, 2019
  • Multiscale dynamical embeddings of complex networks by Michael T. Schaub, Jean-Charles Delvenne, Renaud Lambiotte, and Mauricio Barahona (2019/06/20 12:00)
    Author(s): Michael T. Schaub, Jean-Charles Delvenne, Renaud Lambiotte, and Mauricio Barahona

    Complex systems and relational data are often abstracted as dynamical processes on networks. To understand, predict, and control their behavior, a crucial step is to extract reduced descriptions of such networks. Inspired by notions from control theory, we propose a time-dependent dynamical similari...


    [Phys. Rev. E 99, 062308] Published Thu Jun 20, 2019
  • <i>Ex-ante</i> measure of patent quality reveals intrinsic fitness for citation-network growth by K. W. Higham, M. Governale, A. B. Jaffe, and U. Zülicke (2019/06/17 12:00)
    Author(s): K. W. Higham, M. Governale, A. B. Jaffe, and U. Zülicke

    We have constructed a fitness parameter, characterizing the intrinsic attractiveness for patents to be cited, from attributes of the associated inventions known at the time a patent is granted. This exogenously obtained fitness is shown to determine the temporal growth of the citation network in con...


    [Phys. Rev. E 99, 060301(R)] Published Mon Jun 17, 2019
  • Traffic flow in a crowd of pedestrians walking at different speeds by Akihiro Fujita, Claudio Feliciani, Daichi Yanagisawa, and Katsuhiro Nishinari (2019/06/17 12:00)
    Author(s): Akihiro Fujita, Claudio Feliciani, Daichi Yanagisawa, and Katsuhiro Nishinari

    This study investigates motion in a crowd of pedestrians walking at different speeds. Three pedestrian groups are considered (slow walkers, normal walkers, and fast walkers), and we design the experimental condition by mixing the normal walkers with either the slow or the fast walkers to create flow...


    [Phys. Rev. E 99, 062307] Published Mon Jun 17, 2019
  • Random walker's view of networks whose growth it shapes by Robert J. H. Ross, Charlotte Strandkvist, and Walter Fontana (2019/06/14 12:00)
    Author(s): Robert J. H. Ross, Charlotte Strandkvist, and Walter Fontana

    We study a simple model in which the growth of a network is determined by the location of one or more random walkers. Depending on walker motility rate, the model generates a spectrum of structures situated between well-known limiting cases. We demonstrate that the average degree observed by a walke...


    [Phys. Rev. E 99, 062306] Published Fri Jun 14, 2019
  • Inhibition-induced explosive synchronization in multiplex networks by Sarika Jalan, Vasundhara Rathore, Ajay Deep Kachhvah, and Alok Yadav (2019/06/14 12:00)
    Author(s): Sarika Jalan, Vasundhara Rathore, Ajay Deep Kachhvah, and Alok Yadav

    To date, explosive synchronization (ES) in a network is shown to be originated from considering either degree-frequency correlation, frequency-coupling strength correlation, inertia, or adaptively controlled phase oscillators. Here we show that ES is a generic phenomenon and can occur in any network...


    [Phys. Rev. E 99, 062305] Published Fri Jun 14, 2019
  • Neural field theory of evoked response potentials in a spherical brain geometry by K. N. Mukta, Xiao Gao, and P. A. Robinson (2019/06/12 12:00)
    Author(s): K. N. Mukta, Xiao Gao, and P. A. Robinson

    Evoked response potentials (ERPs) are calculated in spherical and planar geometries using neural field theory of the corticothalamic system. The ERP is modeled as an impulse response and the resulting modal effects of spherical corticothalamic dynamics are explored, showing that results for spherica...


    [Phys. Rev. E 99, 062304] Published Wed Jun 12, 2019
  • Turing patterns mediated by network topology in homogeneous active systems by Sayat Mimar, Mariamo Mussa Juane, Juyong Park, Alberto P. Muñuzuri, and Gourab Ghoshal (2019/06/11 12:00)
    Author(s): Sayat Mimar, Mariamo Mussa Juane, Juyong Park, Alberto P. Muñuzuri, and Gourab Ghoshal

    Mechanisms of pattern formation—of which the Turing instability is an archetype—constitute an important class of dynamical processes occurring in biological, ecological, and chemical systems. Recently, it has been shown that the Turing instability can induce pattern formation in discrete media such ...


    [Phys. Rev. E 99, 062303] Published Tue Jun 11, 2019
  • Mean-field solution of structural balance dynamics in nonzero temperature by F. Rabbani, Amir H. Shirazi, and G. R. Jafari (2019/06/10 12:00)
    Author(s): F. Rabbani, Amir H. Shirazi, and G. R. Jafari

    In signed networks with simultaneous friendly and hostile interactions, there is a general tendency to a global structural balance, based on the dynamical model of links status. Although the structural balance represents a state of the network with a lack of contentious situations, there are always ...


    [Phys. Rev. E 99, 062302] Published Mon Jun 10, 2019
  • Social clustering in epidemic spread on coevolving networks by Hsuan-Wei Lee, Nishant Malik, Feng Shi, and Peter J. Mucha (2019/06/04 12:00)
    Author(s): Hsuan-Wei Lee, Nishant Malik, Feng Shi, and Peter J. Mucha

    Even though transitivity is a central structural feature of social networks, its influence on epidemic spread on coevolving networks has remained relatively unexplored. Here we introduce and study an adaptive susceptible-infected-susceptible (SIS) epidemic model wherein the infection and network coe...


    [Phys. Rev. E 99, 062301] Published Tue Jun 04, 2019
  • Fault tolerance of random graphs with respect to connectivity: Mean-field approximation for semidense random graphs by Satoshi Takabe, Takafumi Nakano, and Tadashi Wadayama (2019/05/29 12:00)
    Author(s): Satoshi Takabe, Takafumi Nakano, and Tadashi Wadayama

    The fault tolerance of random graphs with unbounded degrees with respect to connectivity is investigated, which relates to the reliability of wireless sensor networks with unreliable relay nodes. The model evaluates the network breakdown probability that a graph is disconnected after stochastic node...


    [Phys. Rev. E 99, 050304(R)] Published Wed May 29, 2019
  • Individual perception dynamics in drunk games by Alberto Antonioni, Luis A. Martinez-Vaquero, Cole Mathis, Leto Peel, and Massimo Stella (2019/05/28 12:00)
    Author(s): Alberto Antonioni, Luis A. Martinez-Vaquero, Cole Mathis, Leto Peel, and Massimo Stella

    We study the effects of individual perceptions of payoffs in two-player games. In particular we consider the setting in which individuals' perceptions of the game are influenced by their previous experiences and outcomes. Accordingly, we introduce a framework based on evolutionary games where indivi...


    [Phys. Rev. E 99, 052311] Published Tue May 28, 2019
  • Expanding spatial domains and transient scaling regimes in populations with local cyclic competition by P. P. Avelino, J. Menezes, B. F. de Oliveira, and T. A. Pereira (2019/05/24 12:00)
    Author(s): P. P. Avelino, J. Menezes, B. F. de Oliveira, and T. A. Pereira

    We investigate a six-species class of May-Leonard models leading to the formation of two types of competing spatial domains, each one inhabited by three species with their own internal cyclic rock-paper-scissors dynamics. We study the resulting population dynamics using stochastic numerical simulati...


    [Phys. Rev. E 99, 052310] Published Fri May 24, 2019
  • Spreading of computer viruses on time-varying networks by Terry Brett, George Loukas, Yamir Moreno, and Nicola Perra (2019/05/24 12:00)
    Author(s): Terry Brett, George Loukas, Yamir Moreno, and Nicola Perra

    Social networks are the prime channel for the spreading of computer viruses. Yet the study of their propagation neglects the temporal nature of social interactions and the heterogeneity of users' susceptibility. Here, we introduce a theoretical framework that captures both properties. We study two r...


    [Phys. Rev. E 99, 050303(R)] Published Fri May 24, 2019
  • Graph comparison via the nonbacktracking spectrum by Andrew Mellor and Angelica Grusovin (2019/05/23 12:00)
    Author(s): Andrew Mellor and Angelica Grusovin

    The comparison of graphs is a vitally important, yet difficult task which arises across a number of diverse research areas including biological and social networks. There have been a number of approaches to define graph distance, however, often these are not metrics (rendering standard data-mining t...


    [Phys. Rev. E 99, 052309] Published Thu May 23, 2019
  • Order parameter allows classification of planar graphs based on balanced fixed points in the Kuramoto model by Franz Kaiser and Karen Alim (2019/05/23 12:00)
    Author(s): Franz Kaiser and Karen Alim

    Phase balanced states are a highly underexplored class of solutions of the Kuramoto model and other coupled oscillator models on networks. So far, coupled oscillator research focused on phase synchronized solutions. Yet, global constraints on oscillators may forbid synchronized state, rendering phas...


    [Phys. Rev. E 99, 052308] Published Thu May 23, 2019
  • Voter model on networks and the multivariate beta distribution by Shintaro Mori, Masato Hisakado, and Kazuaki Nakayama (2019/05/22 12:00)
    Author(s): Shintaro Mori, Masato Hisakado, and Kazuaki Nakayama

    In elections, the vote shares or turnout rates show a strong spatial correlation. The logarithmic decay with distance suggests that a two-dimensional (2D) noisy diffusive equation describes the system. Based on the study of U.S. presidential elections data, it was determined that the fluctuations of...


    [Phys. Rev. E 99, 052307] Published Wed May 22, 2019
  • Emergence of frustration signals systemic risk by Chandrashekar Kuyyamudi, Anindya S. Chakrabarti, and Sitabhra Sinha (2019/05/21 12:00)
    Author(s): Chandrashekar Kuyyamudi, Anindya S. Chakrabarti, and Sitabhra Sinha

    We show that the emergence of systemic risk in complex systems can be understood from the evolution of functional networks representing interactions inferred from fluctuation correlations between macroscopic observables. Specifically, we analyze the long-term collective dynamics in the New York Stoc...


    [Phys. Rev. E 99, 052306] Published Tue May 21, 2019
  • Energy cost for controlling complex networks with linear dynamics by Gaopeng Duan, Aming Li, Tao Meng, Guofeng Zhang, and Long Wang (2019/05/21 12:00)
    Author(s): Gaopeng Duan, Aming Li, Tao Meng, Guofeng Zhang, and Long Wang

    Examining the controllability of complex networks has received much attention recently. The focus of many studies is commonly trained on whether we can steer a system from an arbitrary initial state to any final state within finite time with admissible external inputs. In order to accomplish the con...


    [Phys. Rev. E 99, 052305] Published Tue May 21, 2019
  • Propagation of wind-power-induced fluctuations in power grids by Hauke Haehne, Katrin Schmietendorf, Samyak Tamrakar, Joachim Peinke, and Stefan Kettemann (2019/05/20 12:00)
    Author(s): Hauke Haehne, Katrin Schmietendorf, Samyak Tamrakar, Joachim Peinke, and Stefan Kettemann

    Renewable generators perturb the electric power grid with heavily non-Gaussian and time correlated fluctuations. While changes in generated power on timescales of minutes and hours are compensated by frequency control measures, we report subsecond distribution grid frequency measurements with local ...


    [Phys. Rev. E 99, 050301(R)] Published Mon May 20, 2019
  • Sampling networks by nodal attributes by Yohsuke Murase, Hang-Hyun Jo, János Török, János Kertész, and Kimmo Kaski (2019/05/15 12:00)
    Author(s): Yohsuke Murase, Hang-Hyun Jo, János Török, János Kertész, and Kimmo Kaski

    In a social network individuals or nodes connect to other nodes by choosing one of the channels of communication at a time to re-establish the existing social links. Since available data sets are usually restricted to a limited number of channels or layers, these autonomous decision making processes...


    [Phys. Rev. E 99, 052304] Published Wed May 15, 2019
  • Optimal geometry of transportation networks by David Aldous and Marc Barthelemy (2019/05/14 12:00)
    Author(s): David Aldous and Marc Barthelemy

    Motivated by the shape of transportation networks such as subways, we consider a distribution of points in the plane and ask for the network $G$ of given length $L$ that is optimal in a certain sense. In the general model, the optimality criterion is to minimize the average (over pairs of points cho...


    [Phys. Rev. E 99, 052303] Published Tue May 14, 2019
  • Impact of perception models on friendship paradox and opinion formation by Eun Lee, Sungmin Lee, Young-Ho Eom, Petter Holme, and Hang-Hyun Jo (2019/05/10 12:00)
    Author(s): Eun Lee, Sungmin Lee, Young-Ho Eom, Petter Holme, and Hang-Hyun Jo

    Topological heterogeneities of social networks have a strong impact on the individuals embedded in those networks. One of the interesting phenomena driven by such heterogeneities is the friendship paradox (FP), stating that the mean degree of one's neighbors is larger than the degree of oneself. Alt...


    [Phys. Rev. E 99, 052302] Published Fri May 10, 2019
  • Fading of remote synchronization in tree networks of Stuart-Landau oscillators by Baris Karakaya, Ludovico Minati, Lucia Valentina Gambuzza, and Mattia Frasca (2019/05/01 12:00)
    Author(s): Baris Karakaya, Ludovico Minati, Lucia Valentina Gambuzza, and Mattia Frasca

    Remote synchronization (RS) is characterized by the appearance of phase coherence between oscillators that do not directly interact through a structural link in a network but exclusively through other units that are not synchronized or more weakly synchronized with them. This form of phase synchroni...


    [Phys. Rev. E 99, 052301] Published Wed May 01, 2019
  • Reconstruction of dynamic networks with time-delayed interactions in the presence of fast-varying noises by Zhaoyang Zhang, Yang Chen, Yuanyuan Mi, and Gang Hu (2019/04/30 12:00)
    Author(s): Zhaoyang Zhang, Yang Chen, Yuanyuan Mi, and Gang Hu

    Most complex social, biological and technological systems can be described by dynamic networks. Reconstructing network structures from measurable data is a fundamental problem in almost all interdisciplinary fields. Network nodes interact with each other and those interactions often have diversely d...


    [Phys. Rev. E 99, 042311] Published Tue Apr 30, 2019
  • Detectability of macroscopic structures in directed asymmetric stochastic block model by Mateusz Wilinski, Piero Mazzarisi, Daniele Tantari, and Fabrizio Lillo (2019/04/23 12:00)
    Author(s): Mateusz Wilinski, Piero Mazzarisi, Daniele Tantari, and Fabrizio Lillo

    We study the problem of identifying macroscopic structures in networks, characterizing the impact of introducing link directions on the detectability phase transition. To this end, building on the stochastic block model, we construct a class of nontrivially detectable directed networks. We find clos...


    [Phys. Rev. E 99, 042310] Published Tue Apr 23, 2019
  • Spectra of random networks with arbitrary degrees by M. E. J. Newman, Xiao Zhang, and Raj Rao Nadakuditi (2019/04/18 12:00)
    Author(s): M. E. J. Newman, Xiao Zhang, and Raj Rao Nadakuditi

    We derive a message-passing method for computing the spectra of locally treelike networks and an approximation to it that allows us to compute closed-form expressions or fast numerical approximates for the spectral density of random graphs with arbitrary node degrees—the so-called configuration mode...


    [Phys. Rev. E 99, 042309] Published Thu Apr 18, 2019
  • Generating random networks that consist of a single connected component with a given degree distribution by Ido Tishby, Ofer Biham, Eytan Katzav, and Reimer Kühn (2019/04/17 12:00)
    Author(s): Ido Tishby, Ofer Biham, Eytan Katzav, and Reimer Kühn

    We present a method for the construction of ensembles of random networks that consist of a single connected component with a given degree distribution. This approach extends the construction toolbox of random networks beyond the configuration model framework, in which one controls the degree distrib...


    [Phys. Rev. E 99, 042308] Published Wed Apr 17, 2019
  • Diffusion dynamics of a conductance-based neuronal population by Argha Mondal, Sanjeev Kumar Sharma, Ranjit Kumar Upadhyay, M. A. Aziz-Alaoui, Prosenjit Kundu, and Chittaranjan Hens (2019/04/17 12:00)
    Author(s): Argha Mondal, Sanjeev Kumar Sharma, Ranjit Kumar Upadhyay, M. A. Aziz-Alaoui, Prosenjit Kundu, and Chittaranjan Hens

    We study the spatiotemporal dynamics of a conductance-based neuronal cable. The processes of one-dimensional (1D) and 2D diffusion are considered for a single variable, which is the membrane voltage. A 2D Morris-Lecar (ML) model is introduced to investigate the nonlinear responses of an excitable co...


    [Phys. Rev. E 99, 042307] Published Wed Apr 17, 2019
  • Enhancing network synchronizability by strengthening a single node by Huawei Fan, Yafeng Wang, Kai Yang, and Xingang Wang (2019/04/16 12:00)
    Author(s): Huawei Fan, Yafeng Wang, Kai Yang, and Xingang Wang

    In improving the stability of complex dynamical systems, an outstanding problem is how to achieve the desired performance at a low cost. For engineering and biological complex systems whose performance and functionality rely on the synchronous motion of their units, an important question related to ...


    [Phys. Rev. E 99, 042305] Published Tue Apr 16, 2019
  • Mixing patterns and individual differences in networks by George T. Cantwell and M. E. J. Newman (2019/04/16 12:00)
    Author(s): George T. Cantwell and M. E. J. Newman

    We study mixing patterns in networks, meaning the propensity for nodes of different kinds to connect to one another. The phenomenon of assortative mixing, whereby nodes prefer to connect to others that are similar to themselves, has been widely studied, but here we go further and examine how and to ...


    [Phys. Rev. E 99, 042306] Published Tue Apr 16, 2019
  • Fixation time in evolutionary graphs: A mean-field approach by Mahdi Hajihashemi and Keivan Aghababaei Samani (2019/04/12 12:00)
    Author(s): Mahdi Hajihashemi and Keivan Aghababaei Samani

    Using an analytical method we calculate average conditional fixation time of mutants in a general graph-structured population of two types of species. The method is based on Markov chains and uses a mean-field approximation to calculate the corresponding transition matrix. Analytical results are com...


    [Phys. Rev. E 99, 042304] Published Fri Apr 12, 2019
  • Multifractality in random networks with power-law decaying bond strengths by Didier A. Vega-Oliveros, J. A. Méndez-Bermúdez, and Francisco A. Rodrigues (2019/04/10 12:00)
    Author(s): Didier A. Vega-Oliveros, J. A. Méndez-Bermúdez, and Francisco A. Rodrigues

    In this paper we demonstrate numerically that random networks whose adjacency matrices $\mathbf{A}$ are represented by a diluted version of the power-law banded random matrix (PBRM) model have multifractal eigenfunctions. The PBRM model describes one-dimensional samples with random long-range bonds....


    [Phys. Rev. E 99, 042303] Published Wed Apr 10, 2019
  • Fragility and anomalous susceptibility of weakly interacting networks by Giacomo Rapisardi, Alex Arenas, Guido Caldarelli, and Giulio Cimini (2019/04/03 12:00)
    Author(s): Giacomo Rapisardi, Alex Arenas, Guido Caldarelli, and Giulio Cimini

    Percolation is a fundamental concept that has brought new understanding of the robustness properties of complex systems. Here we consider percolation on weakly interacting networks, that is, network layers coupled together by much fewer interlinks than the connections within each layer. For these ki...


    [Phys. Rev. E 99, 042302] Published Wed Apr 03, 2019
  • Critical transitions in heterogeneous networks: Loss of low-degree nodes as an early warning signal by Alessandro Loppini, Simonetta Filippi, and H. Eugene Stanley (2019/04/02 12:00)
    Author(s): Alessandro Loppini, Simonetta Filippi, and H. Eugene Stanley

    A large number of real networks show abrupt phase transition phenomena in response to environmental changes. In this case, cascading phenomena can induce drastic and discontinuous changes in the system state and lead to collapse. Although complex network theory has been used to investigate these dra...


    [Phys. Rev. E 99, 040301(R)] Published Tue Apr 02, 2019
  • Fast consensus clustering in complex networks by Aditya Tandon, Aiiad Albeshri, Vijey Thayananthan, Wadee Alhalabi, and Santo Fortunato (2019/04/01 12:00)
    Author(s): Aditya Tandon, Aiiad Albeshri, Vijey Thayananthan, Wadee Alhalabi, and Santo Fortunato

    Algorithms for community detection are usually stochastic, leading to different partitions for different choices of random seeds. Consensus clustering has proven to be an effective technique to derive more stable and accurate partitions than the ones obtained by the direct application of the algorit...


    [Phys. Rev. E 99, 042301] Published Mon Apr 01, 2019
  • Network model of conviction-driven social segregation by Gianluca Teza, Samir Suweis, Marco Gherardi, Amos Maritan, and Marco Cosentino Lagomarsino (2019/03/29 11:00)
    Author(s): Gianluca Teza, Samir Suweis, Marco Gherardi, Amos Maritan, and Marco Cosentino Lagomarsino

    To measure, predict, and prevent social segregation, it is necessary to understand the factors that cause it. While in most available descriptions space plays an essential role, one outstanding question is whether and how this phenomenon is possible in a well-mixed social network. We define and solv...


    [Phys. Rev. E 99, 032310] Published Fri Mar 29, 2019
  • Understanding the temporal pattern of spreading in heterogeneous networks: Theory of the mean infection time by Mi Jin Lee and Deok-Sun Lee (2019/03/29 11:00)
    Author(s): Mi Jin Lee and Deok-Sun Lee

    For a reliable prediction of an epidemic or information spreading pattern in complex systems, well-defined measures are essential. In the susceptible-infected model on heterogeneous networks, the cluster of infected nodes in the intermediate-time regime exhibits too large fluctuation in size to use ...


    [Phys. Rev. E 99, 032309] Published Fri Mar 29, 2019
  • Cascading failures in scale-free interdependent networks by Malgorzata Turalska, Keith Burghardt, Martin Rohden, Ananthram Swami, and Raissa M. D'Souza (2019/03/28 11:00)
    Author(s): Malgorzata Turalska, Keith Burghardt, Martin Rohden, Ananthram Swami, and Raissa M. D'Souza

    Large cascades are a common occurrence in many natural and engineered complex systems. In this paper we explore the propagation of cascades across networks using realistic network topologies, such as heterogeneous degree distributions, as well as intra- and interlayer degree correlations. We find th...


    [Phys. Rev. E 99, 032308] Published Thu Mar 28, 2019
  • Dynamics of multiplayer games on complex networks using territorial interactions by Pedro H. T. Schimit, Karan Pattni, and Mark Broom (2019/03/27 11:00)
    Author(s): Pedro H. T. Schimit, Karan Pattni, and Mark Broom

    The modeling of evolution in structured populations has been significantly advanced by evolutionary graph theory, which incorporates pairwise relationships between individuals on a network. More recently, a new framework has been developed to allow for multiplayer interactions of variable size in mo...


    [Phys. Rev. E 99, 032306] Published Wed Mar 27, 2019
  • Tensorial and bipartite block models for link prediction in layered networks and temporal networks by Marc Tarrés-Deulofeu, Antonia Godoy-Lorite, Roger Guimerà, and Marta Sales-Pardo (2019/03/27 11:00)
    Author(s): Marc Tarrés-Deulofeu, Antonia Godoy-Lorite, Roger Guimerà, and Marta Sales-Pardo

    Many real-world complex systems are well represented as multilayer networks; predicting interactions in those systems is one of the most pressing problems in predictive network science. To address this challenge, we introduce two stochastic block models for multilayer and temporal networks; one of t...


    [Phys. Rev. E 99, 032307] Published Wed Mar 27, 2019
  • Statistical physics of language maps in the USA by J. Burridge, B. Vaux, M. Gnacik, and Y. Grudeva (2019/03/14 11:00)
    Author(s): J. Burridge, B. Vaux, M. Gnacik, and Y. Grudeva

    Spatial linguistic surveys often reveal well-defined geographical zones where certain linguistic forms are dominant over their alternatives. It has been suggested that these patterns may be understood by analogy with coarsening in models of two-dimensional physical systems. Here we investigate this ...


    [Phys. Rev. E 99, 032305] Published Thu Mar 14, 2019
  • Detecting single-cell stimulation in a large network of integrate-and-fire neurons by Davide Bernardi and Benjamin Lindner (2019/03/11 11:00)
    Author(s): Davide Bernardi and Benjamin Lindner

    Several experiments have shown that the stimulation of a single neuron in the cortex can influence the local network activity and even the behavior of an animal. From the theoretical point of view, it is not clear how stimulating a single cell in a cortical network can evoke a statistically signific...


    [Phys. Rev. E 99, 032304] Published Mon Mar 11, 2019
  • Controlling and enhancing synchronization through adaptive phase lags by Alexander C. Kalloniatis and Markus Brede (2019/03/07 11:00)
    Author(s): Alexander C. Kalloniatis and Markus Brede

    We compare two methods for controlling synchronization in the Kuramoto model on an undirected network. The first is by driving selected oscillators at a desired frequency by coupling to an external driver, and the second is by including adaptive lags—or dynamical frustrations—within the Kuramoto int...


    [Phys. Rev. E 99, 032303] Published Thu Mar 07, 2019
  • Mobility helps problem-solving systems to avoid groupthink by Paulo F. Gomes, Sandro M. Reia, Francisco A. Rodrigues, and José F. Fontanari (2019/03/06 11:00)
    Author(s): Paulo F. Gomes, Sandro M. Reia, Francisco A. Rodrigues, and José F. Fontanari

    Groupthink occurs when everyone in a group starts thinking alike, as when people put unlimited faith in a leader. Avoiding this phenomenon is a ubiquitous challenge to problem-solving enterprises and typical countermeasures involve the mobility of group members. Here we use an agent-based model of i...


    [Phys. Rev. E 99, 032301] Published Wed Mar 06, 2019
  • Reinforcement learning meets minority game: Toward optimal resource allocation by Si-Ping Zhang, Jia-Qi Dong, Li Liu, Zi-Gang Huang, Liang Huang, and Ying-Cheng Lai (2019/03/06 11:00)
    Author(s): Si-Ping Zhang, Jia-Qi Dong, Li Liu, Zi-Gang Huang, Liang Huang, and Ying-Cheng Lai

    The main point of this paper is to provide an affirmative answer through exploiting reinforcement learning (RL) in artificial intelligence (AI) for eliminating herding without any external control in complex resource allocation systems. In particular, we demonstrate that when agents are empowered wi...


    [Phys. Rev. E 99, 032302] Published Wed Mar 06, 2019
  • Grand canonical ensemble of weighted networks by Andrea Gabrielli, Rossana Mastrandrea, Guido Caldarelli, and Giulio Cimini (2019/03/01 11:00)
    Author(s): Andrea Gabrielli, Rossana Mastrandrea, Guido Caldarelli, and Giulio Cimini

    The cornerstone of statistical mechanics of complex networks is the idea that the links, and not the nodes, are the effective particles of the system. Here, we formulate a mapping between weighted networks and lattice gases, making the conceptual step forward of interpreting weighted links as partic...


    [Phys. Rev. E 99, 030301(R)] Published Fri Mar 01, 2019
  • Hipsters on networks: How a minority group of individuals can lead to an antiestablishment majority by Jonas S. Juul and Mason A. Porter (2019/02/26 11:00)
    Author(s): Jonas S. Juul and Mason A. Porter

    The spread of opinions, memes, diseases, and “alternative facts” in a population depends both on the details of the spreading process and on the structure of the social and communication networks on which they spread. One feature that can change spreading dynamics substantially is heterogeneous beha...


    [Phys. Rev. E 99, 022313] Published Tue Feb 26, 2019
  • Role of hubs in the synergistic spread of behavior by Yongjoo Baek, Kihong Chung, Meesoon Ha, Hawoong Jeong, and Daniel Kim (2019/02/25 11:00)
    Author(s): Yongjoo Baek, Kihong Chung, Meesoon Ha, Hawoong Jeong, and Daniel Kim

    The spread of behavior in a society has two major features: the synergy of multiple spreaders and the dominance of hubs. While strong synergy is known to induce mixed-order transitions (MOTs) at percolation, the effects of hubs on the phenomena are yet to be clarified. By analytically solving the ge...


    [Phys. Rev. E 99, 020301(R)] Published Mon Feb 25, 2019
  • Generalization of core percolation on complex networks by N. Azimi-Tafreshi, S. Osat, and S. N. Dorogovtsev (2019/02/22 11:00)
    Author(s): N. Azimi-Tafreshi, S. Osat, and S. N. Dorogovtsev

    We introduce a $k$-leaf removal algorithm as a generalization of the so-called leaf removal algorithm. In this pruning algorithm, vertices of degree smaller than $k$, together with their first nearest neighbors and all incident edges, are progressively removed from a random network. As the result of...


    [Phys. Rev. E 99, 022312] Published Fri Feb 22, 2019
  • Insights into bootstrap percolation: Its equivalence with k-core percolation and the giant component by Matías A. Di Muro, Lucas D. Valdez, H. Eugene Stanley, Sergey V. Buldyrev, and Lidia A. Braunstein (2019/02/21 11:00)
    Author(s): Matías A. Di Muro, Lucas D. Valdez, H. Eugene Stanley, Sergey V. Buldyrev, and Lidia A. Braunstein

    K-core and bootstrap percolation are widely studied models that have been used to represent and understand diverse deactivation and activation processes in natural and social systems. Since these models are considerably similar, it has been suggested in recent years that they could be complementary....


    [Phys. Rev. E 99, 022311] Published Thu Feb 21, 2019
  • Minimal sets to destroy the $k$-core in random networks by Christian Schmidt, Henry D. Pfister, and Lenka Zdeborová (2019/02/20 11:00)
    Author(s): Christian Schmidt, Henry D. Pfister, and Lenka Zdeborová

    We study the problem of finding the smallest set of nodes in a network whose removal results in an empty $k$-core, where the $k$-core is the subnetwork obtained after the iterative removal of all nodes of degree smaller than $k$. This problem is also known in the literature as finding the minimal co...


    [Phys. Rev. E 99, 022310] Published Wed Feb 20, 2019
  • Coevolution of nodes and links: Diversity-driven coexistence in cyclic competition of three species by Kevin E. Bassler, Erwin Frey, and R. K. P. Zia (2019/02/15 11:00)
    Author(s): Kevin E. Bassler, Erwin Frey, and R. K. P. Zia

    When three species compete cyclically in a well-mixed, stochastic system of $N$ individuals, extinction is known to typically occur at times scaling as the system size $N$. This happens, for example, in rock-paper-scissors games or conserved Lotka-Volterra models in which every pair of individuals c...


    [Phys. Rev. E 99, 022309] Published Fri Feb 15, 2019
  • Persistent spatial patterns of interacting contagions by Li Chen (2019/02/14 11:00)
    Author(s): Li Chen

    The spread of infectious diseases, rumors, fashions, and innovations are complex contagion processes, embedded in network and spatial contexts. While the studies in the former context are intensively expanded, the latter remains largely unexplored. In this paper, we investigate the pattern formation...


    [Phys. Rev. E 99, 022308] Published Thu Feb 14, 2019
  • Synchronization in network geometries with finite spectral dimension by Ana P. Millán, Joaquín J. Torres, and Ginestra Bianconi (2019/02/12 11:00)
    Author(s): Ana P. Millán, Joaquín J. Torres, and Ginestra Bianconi

    Recently there is a surge of interest in network geometry and topology. Here we show that the spectral dimension plays a fundamental role in establishing a clear relation between the topological and geometrical properties of a network and its dynamics. Specifically we explore the role of the spectra...


    [Phys. Rev. E 99, 022307] Published Tue Feb 12, 2019
  • Entropy-based randomization of rating networks by Carolina Becatti, Guido Caldarelli, and Fabio Saracco (2019/02/07 11:00)
    Author(s): Carolina Becatti, Guido Caldarelli, and Fabio Saracco

    In recent years, due to the great diffusion of e-commerce, online rating platforms quickly became a common tool for purchase recommendations. However, instruments for their analysis did not evolve at the same speed. Indeed, interesting information about users' habits and tastes can be recovered just...


    [Phys. Rev. E 99, 022306] Published Thu Feb 07, 2019
  • Population size changes and extinction risk of populations driven by mutant interactors by Hye Jin Park, Yuriy Pichugin, Weini Huang, and Arne Traulsen (2019/02/06 11:00)
    Author(s): Hye Jin Park, Yuriy Pichugin, Weini Huang, and Arne Traulsen

    Spontaneous random mutations are an important source of variation in populations. Many evolutionary models consider mutants with a fixed fitness, chosen from a fitness distribution without considering microscopic interactions among the residents and mutants. Here, we go beyond this and consider “mut...


    [Phys. Rev. E 99, 022305] Published Wed Feb 06, 2019
  • Percolation framework of the Earth's topography by Jingfang Fan, Jun Meng, and Abbas Ali Saberi (2019/02/05 11:00)
    Author(s): Jingfang Fan, Jun Meng, and Abbas Ali Saberi

    Self-similarity and long-range correlations are the remarkable features of the Earth's surface topography. Here we develop an approach based on percolation theory to study the geometrical features of Earth. Our analysis is based on high-resolution, 1 arc min, ETOPO1 global relief records. We find so...


    [Phys. Rev. E 99, 022304] Published Tue Feb 05, 2019
  • Distinct dynamical behavior in Erdős-Rényi networks, regular random networks, ring lattices, and all-to-all neuronal networks by M. A. Lopes and A. V. Goltsev (2019/02/04 11:00)
    Author(s): M. A. Lopes and A. V. Goltsev

    Neuronal network dynamics depends on network structure. In this paper we study how network topology underpins the emergence of different dynamical behaviors in neuronal networks. In particular, we consider neuronal network dynamics on Erdős-Rényi (ER) networks, regular random (RR) networks, ring lat...


    [Phys. Rev. E 99, 022303] Published Mon Feb 04, 2019
  • Similar size of slums caused by a Turing instability of migration behavior by Peter F. Pelz, John Friesen, and Jakob Hartig (2019/02/04 11:00)
    Author(s): Peter F. Pelz, John Friesen, and Jakob Hartig

    It is a remarkable fact that the size of slums is similar across the globe, regardless of city, country, or culture [Friesen et al., Habitat Int. 73, 79 (2018)]. The main thesis of this paper is that this universal scale is intrinsic to the slum-city system and is independent from external factors....


    [Phys. Rev. E 99, 022302] Published Mon Feb 04, 2019
  • Effect of network clustering on mutually cooperative coinfections by Peng-Bi Cui (崔鹏碧), Francesca Colaiori, and Claudio Castellano (2019/02/01 11:00)
    Author(s): Peng-Bi Cui (崔鹏碧), Francesca Colaiori, and Claudio Castellano

    When two cooperative contagious diseases spread, there can be a discontinuous epidemic transition depending on the topology of the network of contacts. The authors’ model shows that increasing the number of local contact clusters decreases the size of the discontinuity, but does not remove it. Due to strong finite size effects the discontinuous nature of the transition is then only visible in large networks


    [Phys. Rev. E 99, 022301] Published Fri Feb 01, 2019
  • Role of persistent cascades in diffusion by Steven Morse, Marta C. González, and Natasha Markuzon (2019/01/28 11:00)
    Author(s): Steven Morse, Marta C. González, and Natasha Markuzon

    We define a structural property of real-world large-scale communication networks consisting of the recurring patterns of communication among individuals, which we term persistent cascades. Using methods of inexact tree matching and agglomerative clustering, we group these patterns into classes which...


    [Phys. Rev. E 99, 012323] Published Mon Jan 28, 2019
International Journal of Quantum Information
  • Fidelity-based unitary operation-induced quantum correlation for continuous-variable systems by Liang Liu (2019/08/01 05:26)
    International Journal of Quantum Information, Ahead of Print. <br/> We propose a measure of nonclassical correlation [math] in terms of local Gaussian unitary operations based on square of the fidelity [math] for bipartite continuous-variable systems. This quantity is easier to be calculated or estimated and is a remedy for the local ancilla problem associated with the geometric measurement-induced nonlocality. A simple computation formula of [math] for any [math]-mode Gaussian states is presented and an estimation of [math] for any [math]-mode Gaussian states is given. For any [math]-mode Gaussian states, [math] does not increase after performing a local Gaussian channel on the unmeasured subsystem. Comparing [math] in scale with other quantum correlations such as Gaussian geometric discord for two-mode symmetric squeezed thermal states reveals that [math] is much better in detecting quantum correlations of Gaussian states.
  • Entanglement enhanced distinguishability of coherence-breaking channels by Long-Mei Yang (2019/07/31 09:00)
    International Journal of Quantum Information, Ahead of Print. <br/> Originating from the superposition principle in quantum mechanics, coherence has been extensively studied as a kind of important resource in quantum information processing. We investigate the distinguishability of coherence-breaking channels with the help of quantum entanglement. By explicitly computing the minimal error probability of channel discrimination, it is shown that entanglement can enhance the capacity of coherence-breaking channel distinguishability with same types for some cases while it cannot be enhanced for some other cases. For coherence-breaking channels with different types, the channel distinguishability cannot be enhanced via entanglement.
  • Adiabatic demagnetization at absolute negative temperature: Generation of quantum correlations by Gregory B. Furman (2019/06/28 11:42)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> In this paper, we study behavior of the correlations, both quantum and classical, under adiabatic demagnetization process in systems of nuclear spins with dipole–dipole interactions in an external magnetic field and in the temperature range including positive and negative temperatures. For a two-spin system, analytical expressions for the quantum and classical correlations are obtained. It is revealed that the field dependences of the quantum and classical correlations at positive and negative temperatures are substantially different. This difference most clearly appears in the case of zero magnetic field: at negative temperature, the measures of quantum correlations tend to the maximum values with a temperature increase. At positive temperature, these quantities tend to zero at a decrease of magnetic field. It is also found that, for the nearest-neighboring spins in the same field, the values of concurrence and discord are larger at negative temperatures than at positive ones.
  • Continuous-time quantum search and time-dependent two-level quantum systems by Carlo Cafaro (2019/06/28 11:42)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> It was recently emphasized by Byrnes, Forster and Tessler [Phys. Rev. Lett. 120 (2018) 060501] that the continuous-time formulation of Grover’s quantum search algorithm can be intuitively understood in terms of Rabi oscillations between the source and the target subspaces. In this work, motivated by this insightful remark and starting from the consideration of a time-independent generalized quantum search Hamiltonian as originally introduced by Bae and Kwon [Phys. Rev. A 66 (2002) 012314], we present a detailed investigation concerning the physical connection between quantum search Hamiltonians and exactly solvable time-dependent two-level quantum systems. Specifically, we compute in an exact analytical manner the transition probabilities from a source state to a target state in a number of physical scenarios specified by a spin-[math] particle immersed in an external time-dependent magnetic field. In particular, we analyze both the periodic oscillatory as well as the monotonic temporal behaviors of such transition probabilities and, moreover, explore their analogy with characteristic features of Grover-like and fixed-point quantum search algorithms, respectively. Finally, we discuss from a physics standpoint the connection between the schedule of a search algorithm, in both adiabatic and nonadiabatic quantum mechanical evolutions, and the control fields in a time-dependent driving Hamiltonian.
  • Classical and quantum correlations for a family of two-qutrit states by Hossein Parsian (2019/06/28 11:42)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> The classical and quantum correlations for a family of two-qutrit states are investigated. For this purpose, a family of two-qutrit states, as well as a set of measurements are proposed. An analytical quantum discord treatment is presented for this family of two-qutrit states. Finally, we compute and illustrate the entanglement of formation, classical mutual information and quantum discord for this family of two-qutrit quantum states.
  • Multi-party quantum summation with a single [math]-level quantum system by C. Zhang (2019/06/28 11:42)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> A multi-party quantum summation with a single [math]-level quantum system is proposed, in which a semi-honest third party (TP) is employed. Only sequential communication of a single quantum [math]-level system (for any prime [math]) is required in the presented protocol, resulting in advantages in scalability. In addition, it can be realized with state-of-the-art technology. Due to the semi-honest TP, the protocol is not only secure against outside attacks, but also secure against participant attacks.
  • Generation of elementary gates and Bell’s states using controlled adiabatic evolutions by Abderrahim Benmachiche (2019/06/28 11:41)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> Fundamental quantum gates can be implemented effectively using adiabatic quantum computation or circuit model. Recently, Hen combined the two approaches to introduce a new model called controlled adiabatic evolutions [I. Hen, Phys. Rev. A, 91(2) (2015) 022309]. This model was specifically designed to implement one and two-qubit controlled gates. Later, Santos extended Hen’s work to implement [math]-qubit controlled gates [A. C. Santos and M. S. Sarandy, Sci. Rep., 5 (2015) 15775]. In this paper, we discuss the implementation of each of the usual quantum gates, as well as demonstrate the possibility of preparing Bell’s states using the controlled adiabatic evolutions approach. We conclude by presenting the fidelity results of implementing single quantum gates and Bell’s states in open systems.
  • New constructions of entanglement-assisted quantum MDS codes from negacyclic codes by Ruihu Li (2019/06/28 11:41)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> When constructing quantum codes under the entanglement-assisted (EA) stabilizer formalism, one can ignore the limitation of dual-containing condition. This allows us to construct EA quantum error-correcting codes (QECCs) from any classical linear codes. The main contribution of this manuscript is to make a general statement for determining the optimal number of pre-shared qubits instead of presenting only specific cases. Let [math] and [math], where [math] is an odd prime power, [math] and [math]. By deeply investigating the decomposition of the defining set of negacyclic codes, we generalize the number of pre-shared entanglement pairs of Construction (1) in Lu et al. [Quantom Inf. Process. 17 (2018) 69] from [math] to arbitrary even numbers less than or equal to [math]. Consequently, a series of EA quantum maximum distance separable (EAQMDS) codes can be produced. The absolute majority of them are new and the minimum distance can be up to [math]. Moreover, this method can be applied to construct many other families of EAQECCs with good parameters, especially large minimum distance.
  • Semiquantum secure direct communication with authentication based on single-photons by Ming-Ming Wang (2019/06/28 11:41)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> Semiquantum cryptography has drawn much attention in recent years since it simplifies the implementation of quantum cryptographic protocols. In this paper, we study semiquantum secure direct communication (SQSDC). Based on single-photons, we propose a two-step SQSDC protocol with identity authentication, which can be used to prevent impersonation and the man-in-the-middle attack. Different from previous protocols based on quantum entanglement or quantum memory, our protocol removes there restrictions for simplifying its physical implementation. We prove that our two-step SQSDC protocol is completely robust. That is, any adversarial attempting to learn some information on the secure message or identity strings will inevitably induce some errors that can be detected by communicators.
  • Cryptanalysis of He’s quantum private comparison protocol and a new protocol by WanQing Wu (2019/06/28 11:41)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> Recently, He proposed a novel quantum private comparison protocol without a third party (G. P. He, Int. J. Quantum Inf. 15(2) (2016) 1750014). This paper points out that two security loopholes in He’s protocol are existent. And a new QPC protocol which can avoid these loopholes is proposed without the help of a third party in this paper.
  • Two new constructions of approximately symmetric informationally complete positive operator-valued measures by Gang Wang (2019/06/28 11:41)
    International Journal of Quantum Information, Volume 17, Issue 03, April 2019. <br/> A symmetric informationally complete positive operator-valued measure (SIC-POVM) is a POVM in [math] consisting of [math] positive operators of rank one such that all of whose Hermite inner products are equal. SIC-POVMs are important in quantum information theory, which have many applications in quantum state tomography, quantum cryptography and basic research in quantum mechanics. However, it is very difficult to construct SIC-POVMs. Therefore, many scholars have focused on approximately symmetric informationally complete positive operator-valued measures (ASIC-POVMs) for which the Hermite inner products are close to equal. In this paper, two new constructions of ASIC-POVMs are provided by using character sums and some special functions over finite fields.
  • Comparing the randomized benchmarking figure with the average infidelity of a quantum gate-set by Jiaan Qi (2019/06/14 08:25)
    International Journal of Quantum Information, Ahead of Print. <br/> Randomized benchmarking (RB) is a popular procedure used to gauge the performance of a set of gates useful for quantum information processing (QIP). Recently, Proctor et al. [Phys. Rev. Lett. 119 (2017) 130502] demonstrated a practically relevant example where the RB measurements give a number [math], very different from the actual average gate-set infidelity [math], despite past theoretical assurances that the two should be equal. Here, we derive formulas for [math], and for [math] from the RB protocol, in a manner permitting easy comparison of the two. We show in general that, indeed, [math], i.e. RB does not measure average infidelity, and, in fact, neither one bounds the other. We give several examples, all plausible in real experiments, to illustrate the differences in [math] and [math]. Many recent papers on experimental implementations of QIP have claimed the ability to perform high-fidelity gates because they demonstrated small [math] values using RB. Our analysis shows that such a statement from RB alone has to be interpreted with caution.
  • Suppressing the information losses of accelerated qubit–qutrit system by M. Y. Abd-Rabbou (2019/06/12 10:01)
    International Journal of Quantum Information, Ahead of Print. <br/> Protecting the accelerated information coherence and suppressing of its decay due to the acceleration is achieved by using different noisy channels. The behavior of three different types of information; Fisher, nonlocal and local information of qubit–qutrit system is discussed. It is shown that, the estimation rate of the acceleration parameter is maximized if both subsystems are accelerated and interacted locally with their noise channels. However, if the largest subsystem is accelerated, then the estimation rate is minimized. The rate of change of the nonlocal information depends on which subsystem is accelerated. The results display that the local information is almost unaltered during the acceleration process, that is, the information is frozen. We show that the phase-flip channel represents the weak channel, where its suppressing of the decay due to the acceleration is smaller than the dephasing and depolarize of channels.
  • A novel quantum steganography scheme based on ASCII by Jia Luo (2019/06/10 11:04)
    International Journal of Quantum Information, Ahead of Print. <br/> Based on the novel enhanced quantum representation for quantum image (NEQR), a new blind quantum steganography scheme is proposed. In this scheme, an improved quantum representation of text utilizing American Standard Code for Information Interchange (ASCII) is provided that uses two qubit sequences to store the same quantum text message. The general embedding process of the scheme is as follows: First, the cover image of size [math] will be divided into eight blocks of size [math] and the secret quantum text of size [math] is scrambled by Gray code transform method. Then, the disorder quantum text is embedded into the eight blocks of cover image employing the Gray code as a judgment condition. Meanwhile, the corresponding quantum circuits are drawn. Through the analysis of all quantum circuits, it can be concluded that the scheme has a lower complexity that is [math]. And the performance of the proposed scheme is analyzed in terms of simulation results of three items: visual quality, capacity and robustness.
  • Steering evolution of two-mode Gaussian states in noisy environments by Farkhondeh Abbasnezhad (2019/06/10 11:04)
    International Journal of Quantum Information, Ahead of Print. <br/> Steering, a quantum property existing in some bipartite entangled systems, causes the local measurements on one part to change the state of the other part at any distance. In this paper, the dynamics of steering between two uncoupled oscillators in squeezed thermal, thermal and vacuum environments are compared. Assuming that the two oscillators are coupled to a common environment or two similar environments, the evolution of steering is obtained using Linblad equation in Born–Markov approximation. It is observed that when the two oscillators are initially in uni-modal squeezed states, the interaction with a common squeezed thermal environment induces steering between them after a short time. However, in other common and the two similar environments, steering does not appear. In addition, when two oscillators are initially in a squeezed thermal state, it is observed that steering decreases monotonically and disappears in a short time in common thermal, common vacuum and the two similar environments. Moreover, steering survives the most in a common squeezed thermal environment.
  • Geometric measures of discordlike quantum correlations based on Tsallis relative entropy by Weijing Li (2019/06/06 12:10)
    International Journal of Quantum Information, Ahead of Print. <br/> A kind of new geometric measure of quantum correlations is formulated. The proposed formulation is in terms of the quantum Tsallis relative entropy and can naturally be viewed as a one-parameter extension quantum discordlike measure that satisfies all requirements of a good measure of quantum correlations. It is of an elegant analytic expression and contains several existing good quantum correlation measures as special cases. The partial coherence measure is also investigated.
  • Bohmian mechanics for instrumentalists by Hrvoje Nikolić (2019/05/23 05:51)
    International Journal of Quantum Information, Ahead of Print. <br/> We formulate Bohmian mechanics (BM) such that the main objects of concern are macroscopic phenomena, while microscopic particle trajectories only play an auxiliary role. Such a formulation makes it easy to understand why BM always makes the same measurable predictions as standard quantum mechanics (QM), irrespective of the details of microscopic trajectories. Relativistic quantum field theory (QFT) is interpreted as an effective long-distance theory that at smaller distances must be replaced by some more fundamental theory. Analogy with condensed-matter physics suggests that this more fundamental theory could have a form of nonrelativistic QM, offering a simple generic resolution of an apparent conflict between BM and relativistic QFT.
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