PRA: Quantum information

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Recently published articles in Phys. Rev. A in the Table of Content section "Quantum information"
Updated: 44 min 52 sec ago

Anisotropic efficiency of adaptive measurements in two-parameter estimation for states in manifolds with nonzero Berry curvature

Mon, 2024-07-22 12:00

Author(s): Hai-Jun Xing

The efficiency of quantum measurements in distinguishing neighboring quantum states is a central topic in quantum information sciences. We study the efficiency of vertex measurement in two-parameter estimation from the information geometry perspective, where the vertex measurement is a rare typical …


[Phys. Rev. A 110, 012449] Published Mon Jul 22, 2024

Categories: Journals, Physics

Improved security analysis for phase-encoding twin-field quantum key distribution

Mon, 2024-07-22 12:00

Author(s): Yang-Guang Shan, Yao Zhou, Zhen-Qiang Yin, Shuang Wang, Wei Chen, De-Yong He, Guang-Can Guo, and Zheng-Fu Han

Twin-field (TF) quantum key distribution (QKD) has been extensively researched because of its long transmission distance. The phase-encoding TF-QKD can realize both a high key rate and a long transmission distance, so it has attracted a lot of attention. In this article, we are inspired by the sendi…


[Phys. Rev. A 110, 012450] Published Mon Jul 22, 2024

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Multiparty Spohn's theorem for a combination of local Markovian and non-Markovian quantum dynamics

Mon, 2024-07-22 12:00

Author(s): Ahana Ghoshal and Ujjwal Sen

We obtain a Gorini-Kossakowski-Sudarshan-Lindblad-like master equation for two or more quantum systems connected locally to a combination of Markovian and non-Markovian heat baths. The master equation was originally formulated for multiparty systems with either exclusively Markovian or non-Markovian…


[Phys. Rev. A 110, 012451] Published Mon Jul 22, 2024

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Quantifying subspace entanglement with geometric measures

Mon, 2024-07-22 12:00

Author(s): Xuanran Zhu, Chao Zhang, and Bei Zeng

Determining whether a subspace spanned by certain quantum states is entangled and its entanglement dimensionality remains a fundamental challenge in quantum information science. This paper introduces a geometric measure of r-bounded rank, Er(S), for a given subspace S. Derived from the established g…


[Phys. Rev. A 110, 012452] Published Mon Jul 22, 2024

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Increasing memory lifetime of quantum low-density parity check codes with sliding-window noisy syndrome decoding

Mon, 2024-07-22 12:00

Author(s): Shilin Huang and Shruti Puri

Quantum error correction (QEC) with single-shot decoding enables the reduction of errors after every single round of noisy stabilizer measurement, easing the time-overhead requirements for fault tolerance. Notably, several classes of quantum low-density parity check (qLDPC) codes are known which fac…


[Phys. Rev. A 110, 012453] Published Mon Jul 22, 2024

Categories: Journals, Physics

Entanglement structure detection via computer vision

Fri, 2024-07-19 12:00

Author(s): Rui Li, Junling Du, Zheng Qin, Shikun Zhang, Chunxiao Du, Yang Zhou, and Zhisong Xiao

Quantum entanglement plays a pivotal role in various quantum information processing tasks. However, a universal and effective way to detect entanglement structures is still lacking, especially for high-dimensional and multipartite quantum systems. Noticing the mathematical similarities between the c…


[Phys. Rev. A 110, 012448] Published Fri Jul 19, 2024

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Channel attention for quantum convolutional neural networks

Fri, 2024-07-19 12:00

Author(s): Gekko Budiutama, Shunsuke Daimon, Hirofumi Nishi, Ryui Kaneko, Tomi Ohtsuki, and Yu-ichiro Matsushita

Quantum convolutional neural networks (QCNNs) have gathered attention as one of the most promising algorithms for quantum machine learning. Reduction in the cost of training as well as improvement in performance are required for practical implementation of these models. In this study, we propose a c…


[Phys. Rev. A 110, 012447] Published Fri Jul 19, 2024

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Variational Gibbs state preparation on noisy intermediate-scale quantum devices

Thu, 2024-07-18 12:00

Author(s): Mirko Consiglio, Jacopo Settino, Andrea Giordano, Carlo Mastroianni, Francesco Plastina, Salvatore Lorenzo, Sabrina Maniscalco, John Goold, and Tony J. G. Apollaro

The preparation of an equilibrium thermal state of a quantum many-body system on noisy intermediate-scale quantum (NISQ) devices is an important task in order to extend the range of applications of quantum computation. Faithful Gibbs state preparation would pave the way to investigate protocols such…


[Phys. Rev. A 110, 012445] Published Thu Jul 18, 2024

Categories: Journals, Physics

Memory in quantum processes with indefinite time direction and causal order

Thu, 2024-07-18 12:00

Author(s): Göktuğ Karpat and Barış Çakmak

We examine the emergence of dynamical memory effects in quantum processes having indefinite time direction and causal order. In particular, we focus on the class of phase-covariant qubit channels, which encompasses some of the most significant paradigmatic open quantum system models. In order to ass…


[Phys. Rev. A 110, 012446] Published Thu Jul 18, 2024

Categories: Journals, Physics

Self-testing of multiple unsharpness parameters through sequential violations of a noncontextual inequality

Wed, 2024-07-17 12:00

Author(s): Rajdeep Paul, Souradeep Sasmal, and A. K. Pan

Self-testing protocols refer to novel device-independent certification schemes wherein the devices are uncharacterized and the dimension of the system remains unspecified. The optimal quantum violation of Bell's inequality facilitates such self-testing. In this work we put forth a protocol for self-…


[Phys. Rev. A 110, 012444] Published Wed Jul 17, 2024

Categories: Journals, Physics

Variational-quantum-eigensolver–inspired optimization for spin-chain work extraction

Wed, 2024-07-17 12:00

Author(s): Ivan Medina, Alexandre Drinko, Guilherme I. Correr, Pedro C. Azado, and Diogo O. Soares-Pinto

The energy extraction from quantum sources is a key task to develop new quantum devices such as quantum batteries (QB). In this context, one of the main figures of merit is the ergotropy, which measures the maximal amount of energy (as work) that can be extracted from the quantum source by means of …


[Phys. Rev. A 110, 012443] Published Wed Jul 17, 2024

Categories: Journals, Physics

Disentanglement-induced multistability

Mon, 2024-07-15 12:00

Author(s): Eyal Buks

Multistability is experimentally observed in a variety of quantum systems but cannot be derived from any theoretical model that is based on a monostable master equation. The author investigates the relation between disentanglement and multistability in the few-spin transverse Ising model and finds that multistability can be obtained in the presence of spontaneous disentanglement.


[Phys. Rev. A 110, 012439] Published Mon Jul 15, 2024

Categories: Journals, Physics

Non-Markovian quantum dynamics from symmetric measurements

Mon, 2024-07-15 12:00

Author(s): Katarzyna Siudzińska

We use symmetric measurement operators to construct quantum channels that provide a further generalization of generalized Pauli channels. The resulting maps are bistochastic but, in general, no longer mixed unitary. We analyze their important properties, such as complete positivity and the ability t…


[Phys. Rev. A 110, 012440] Published Mon Jul 15, 2024

Categories: Journals, Physics

Cabello's nonlocality argument for multisetting high-dimensional systems and its experimental test

Mon, 2024-07-15 12:00

Author(s): Ming Yang, Dongkai Zhang, and Lixiang Chen

Recent advancements have expanded Hardy's nonlocality arguments into multisetting and multidimensional systems to enhance quantum correlations. In comparison with Hardy's nonlocality argument, Cabello's nonlocality argument (CNA) emerges as a superior choice for illustrating nonlocal features. An op…


[Phys. Rev. A 110, 012441] Published Mon Jul 15, 2024

Categories: Journals, Physics

Noise mitigation in quantum teleportation

Mon, 2024-07-15 12:00

Author(s): Zi-Jian Xu and Jun-Hong An

Permitting the transmission of unknown quantum states over long distances by using entanglement, quantum teleportation serves as an important building block for many quantum technologies. However, in the noisy intermediate-scale quantum era, the practical realization of quantum teleportation is inev…


[Phys. Rev. A 110, 012442] Published Mon Jul 15, 2024

Categories: Journals, Physics

Mixed-integer linear programming solver using Benders decomposition assisted by a neutral-atom quantum processor

Fri, 2024-07-12 12:00

Author(s): M. Yassine Naghmouchi and Wesley da Silva Coelho

This paper presents a hybrid classical-quantum approach to solve mixed-integer linear programming (MILP) using neutral-atom quantum computations. We apply Benders decomposition (BD) to segment MILPs into a master problem (MP) and a subproblem, where the MP is addressed using a neutral-atom device, a…


[Phys. Rev. A 110, 012434] Published Fri Jul 12, 2024

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Factory-based fault-tolerant preparation of quantum polar codes encoding one logical qubit

Fri, 2024-07-12 12:00

Author(s): Ashutosh Goswami, Mehdi Mhalla, and Valentin Savin

A fault-tolerant way to prepare logical code states of Q1 codes, i.e., quantum polar codes encoding one qubit, was recently proposed. The fault tolerance therein is guaranteed by an error detection gadget, where, if an error is detected during the preparation, one entirely discards the preparation. …


[Phys. Rev. A 110, 012438] Published Fri Jul 12, 2024

Categories: Journals, Physics

Almost-optimal computational-basis-state transpositions

Fri, 2024-07-12 12:00

Author(s): Steven Herbert, Julien Sorci, and Yao Tang

We give an explicit construction to perform any n-qubit computational-basis-state transposition using Θ(n) gates. This nearly coincides with the lower bound Ω[n/log(nd)] on worst-case and average-case gate complexities to perform transpositions using a d-element gate set, which we also prove.


[Phys. Rev. A 110, 012437] Published Fri Jul 12, 2024

Categories: Journals, Physics

Quantum Bayes classifiers and their application in image classification

Fri, 2024-07-12 12:00

Author(s): Ming-Ming Wang and Xiao-Ying Zhang

Bayesian networks are powerful tools for probabilistic analysis and have been widely used in machine learning and data science. Unlike the time-consuming parameter training process of neural networks, Bayes classifiers constructed on Bayesian networks can make decisions based solely on statistical d…


[Phys. Rev. A 110, 012433] Published Fri Jul 12, 2024

Categories: Journals, Physics

Non-Markov quantum belief propagation

Fri, 2024-07-12 12:00

Author(s): Jack Ceroni, Ian MacCormack, and Guillaume Verdon

We provide a rigorous proof of the approximate convergence of sliding-window quantum belief-propagation as outlined heuristically in the work of Bilgin and Poulin [Phys. Rev. B 81, 054106 (2010)], in the absence of the quantum Markov property. In particular, we confirm the hypothesis outlined in thi…


[Phys. Rev. A 110, 012435] Published Fri Jul 12, 2024

Categories: Journals, Physics