PRA: Quantum information

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Recently published articles in Phys. Rev. A in the Table of Content section "Quantum information"
Updated: 33 min 3 sec ago

Construction of general symmetric-informationally-complete–positive-operator-valued measures by using a complete orthogonal basis

Wed, 2022-08-10 12:00

Author(s): Masakazu Yoshida and Gen Kimura

A general symmetric-informationally-complete (GSIC)–positive-operator-valued measure (POVM) is known to provide an optimal quantum state tomography among minimal IC POVMs with a fixed average purity. In this paper we provide a general construction of a GSIC POVM by means of a complete orthogonal bas…

[Phys. Rev. A 106, 022408] Published Wed Aug 10, 2022

Categories: Journals, Physics

Process-optimized phase-covariant quantum cloning

Tue, 2022-08-09 12:00

Author(s): Chloe Kim and Eric Chitambar

After the appearance of the no-cloning theorem, approximate quantum cloning machines (QCMs) has become a well-studied subject in quantum information theory. Among several measures to quantify the performance of a QCM, single-qudit fidelity and global fidelity have been most widely used. In this pape…

[Phys. Rev. A 106, 022405] Published Tue Aug 09, 2022

Categories: Journals, Physics

Quantum simulations of molecular systems with intrinsic atomic orbitals

Tue, 2022-08-09 12:00

Author(s): Stefano Barison, Davide E. Galli, and Mario Motta

Quantum simulations of molecular systems on quantum computers often employ minimal basis sets of Gaussian orbitals. In comparison with more realistic basis sets, quantum simulations employing minimal basis sets require fewer qubits and quantum gates but yield results of lower accuracy. A natural str…

[Phys. Rev. A 106, 022404] Published Tue Aug 09, 2022

Categories: Journals, Physics

Characteristic, dynamic, and near-saturation regions of out-of-time-order correlation in Floquet Ising models

Mon, 2022-08-08 12:00

Author(s): Rohit Kumar Shukla and Sunil Kumar Mishra

We study characteristic, dynamic, and saturation regimes of the out-of-time-order correlation (OTOC) in the constant-field Floquet system with and without longitudinal field. In the calculation of OTOC, we take local spins in longitudinal and transverse directions as observables which are local and …

[Phys. Rev. A 106, 022403] Published Mon Aug 08, 2022

Categories: Journals, Physics

Relation between quantum coherence and quantum entanglement in quantum measurements

Fri, 2022-08-05 12:00

Author(s): Ho-Joon Kim and Soojoon Lee

Quantum measurement is a class of quantum channels that sends quantum states to classical states. We set up resource theories of quantum coherence and quantum entanglement for quantum measurements and find relations between them. For this, we conceive a relative entropy-type quantity to account for …

[Phys. Rev. A 106, 022401] Published Fri Aug 05, 2022

Categories: Journals, Physics

Implementation of a discrete-time quantum walk with a circulant matrix on a graph by optical polarizing elements

Fri, 2022-08-05 12:00

Author(s): Yusuke Mizutani, Tomoyuki Horikiri, Leo Matsuoka, Yusuke Higuchi, and Etsuo Segawa

In this paper, we introduce a quantum walk whose local scattering at each vertex is denoted by a unitary circulant matrix, namely, the circulant quantum walk. We also introduce another quantum walk induced by the circulant quantum walk, namely, the optical quantum walk, whose underlying graph is a 2…

[Phys. Rev. A 106, 022402] Published Fri Aug 05, 2022

Categories: Journals, Physics

Negative result about the construction of genuinely entangled subspaces from unextendible product bases

Fri, 2022-07-29 12:00

Author(s): Maciej Demianowicz

Unextendible product bases (UPBs) provide a versatile tool with various applications across different areas of quantum information theory. Their comprehensive characterization is thus of great importance and has been a subject of vital interest for over two decades now. An open question asks about t…

[Phys. Rev. A 106, 012442] Published Fri Jul 29, 2022

Categories: Journals, Physics

Classification of small triorthogonal codes

Thu, 2022-07-28 12:00

Author(s): Sepehr Nezami and Jeongwan Haah

Triorthogonal codes are a class of quantum error-correcting codes used in magic state distillation protocols. We classify all triorthogonal codes with n+k≤38, where n is the number of physical qubits and k is the number of logical qubits of the code. We find 38 distinguished triorthogonal subspaces,…

[Phys. Rev. A 106, 012437] Published Thu Jul 28, 2022

Categories: Journals, Physics

Measure of invertible dynamical maps under convex combinations of noninvertible dynamical maps

Thu, 2022-07-28 12:00

Author(s): Vinayak Jagadish, R. Srikanth, and Francesco Petruccione

We study the convex combinations of the (d+1)-generalized Pauli dynamical maps in a Hilbert space of dimension d. For certain choices of the decoherence function, the maps are noninvertible, and they remain under convex combinations as well. For the case of dynamical maps characterized by the decohe…

[Phys. Rev. A 106, 012438] Published Thu Jul 28, 2022

Categories: Journals, Physics

Algorithmic cooling for resolving state preparation and measurement errors in quantum computing

Thu, 2022-07-28 12:00

Author(s): Raymond Laflamme, Junan Lin, and Tal Mor

State preparation and measurement errors are commonly regarded as indistinguishable. The problem of distinguishing state preparation errors from measurement errors is important to the field of characterizing quantum processors. In this work, we propose a method to separately characterize state prepa…

[Phys. Rev. A 106, 012439] Published Thu Jul 28, 2022

Categories: Journals, Physics

Experimental mutual coherence from separable coherent qubits

Thu, 2022-07-28 12:00

Author(s): Nikola Horová, Robert Stárek, Michal Mičuda, Jaromír Fiurášek, Michal Kolář, and Radim Filip

Quantum coherence is a fundamental resource in modern quantum physics with important applications in quantum technologies. In composite quantum systems, various forms of coherence emerge and play an important role, such as the global coherence, coherence of local subsystems, and the recently introdu…

[Phys. Rev. A 106, 012440] Published Thu Jul 28, 2022

Categories: Journals, Physics

Quantifying information scrambling via classical shadow tomography on programmable quantum simulators

Thu, 2022-07-28 12:00

Author(s): Max McGinley, Sebastian Leontica, Samuel J. Garratt, Jovan Jovanovic, and Steven H. Simon

We develop techniques to probe the dynamics of quantum information and implement them experimentally on an IBM superconducting quantum processor. Our protocols adapt shadow tomography for the study of time-evolution channels rather than of quantum states and rely only on single-qubit operations and …

[Phys. Rev. A 106, 012441] Published Thu Jul 28, 2022

Categories: Journals, Physics

Information spreading and scrambling in disorder-free multiple-spin-interaction models

Wed, 2022-07-27 12:00

Author(s): Yoshihito Kuno, Takahiro Orito, and Ikuo Ichinose

Tripartite mutual information (TMI) is an efficient observable to quantify the ability of a scrambler for the unitary time-evolution operator with a quenched many-body Hamiltonian. In this paper we give numerical demonstrations of the TMI in disorder-free (translationally invariant) spin models with…

[Phys. Rev. A 106, 012435] Published Wed Jul 27, 2022

Categories: Journals, Physics

Quantifying coherence relative to channels via metric-adjusted skew information

Wed, 2022-07-27 12:00

Author(s): Yuan Sun, Nan Li, and Shunlong Luo

In terms of the metric-adjusted skew information (an important and versatile class of quantum Fisher information), which generalizes the seminal Wigner-Yanase skew information arising naturally from the study of quantum measurement, we propose a family of coherence measures of states relative to qua…

[Phys. Rev. A 106, 012436] Published Wed Jul 27, 2022

Categories: Journals, Physics

Exploring superadditivity of coherent information of noisy quantum channels through genetic algorithms

Tue, 2022-07-26 12:00

Author(s): Govind Lal Sidhardh, Mir Alimuddin, and Manik Banik

Machine learning techniques are increasingly being used in fundamental research to solve various challenging problems. Here we explore one such technique to address an important problem in the quantum communication scenario. While transferring quantum information through a noisy quantum channel, the…

[Phys. Rev. A 106, 012432] Published Tue Jul 26, 2022

Categories: Journals, Physics

Quantum simulation of quantum phase transitions using the convex geometry of reduced density matrices

Tue, 2022-07-26 12:00

Author(s): Samuel Warren, LeeAnn M. Sager-Smith, and David A. Mazziotti

Transitions of many-particle quantum systems between distinct phases at absolute-zero temperature, known as quantum phase transitions, require an exacting treatment of particle correlations. In this work, we present a general quantum-computing approach to quantum phase transitions that exploits the …

[Phys. Rev. A 106, 012434] Published Tue Jul 26, 2022

Categories: Journals, Physics

Scalable noncontextuality inequalities and certification of multiqubit quantum systems

Mon, 2022-07-25 12:00

Author(s): Rafael Santos, Chellasamy Jebarathinam, and Remigiusz Augusiak

We propose a family of noncontextuality inequalities and show that they can be used for certification of multiqubit quantum systems. Our scheme, unlike those based on nonlocality, does not require spatial separation between the subsystems, yet it makes use of certain compatibility relations between …

[Phys. Rev. A 106, 012431] Published Mon Jul 25, 2022

Categories: Journals, Physics

Quantum steering as resource of quantum teleportation

Mon, 2022-07-25 12:00

Author(s): Yi Fan, Chuanlei Jia, and Liang Qiu

Quantum steering, which lies between Bell nonlocality and entanglement, is a characteristic quantum correlation. Its application in quantum information tasks is worth pursuing. In this paper, we investigate the application of quantum steering as resource of quantum teleportation. It is found that tw…

[Phys. Rev. A 106, 012433] Published Mon Jul 25, 2022

Categories: Journals, Physics

Quantum computation capability verification protocol for noisy intermediate-scale quantum devices with the dihedral coset problem

Fri, 2022-07-22 12:00

Author(s): Ruge Lin and Weiqiang Wen

In this article, we propose an interactive protocol for one party (the verifier) holding a quantum computer to verify the quantum computation power of another party's (the prover) device via a one-way quantum channel. This protocol is referred to as the dihedral coset problem (DCP) challenge. The ve…

[Phys. Rev. A 106, 012430] Published Fri Jul 22, 2022

Categories: Journals, Physics

Schrieffer-Wolff transformations for experiments: Dynamically suppressing virtual doublon-hole excitations in a Fermi-Hubbard simulator

Thu, 2022-07-21 12:00

Author(s): Anant Kale, Jakob Hendrik Huhn, Muqing Xu, Lev Haldar Kendrick, Martin Lebrat, Christie Chiu, Geoffrey Ji, Fabian Grusdt, Annabelle Bohrdt, and Markus Greiner

In strongly interacting systems with a separation of energy scales, low-energy effective Hamiltonians help provide insights into the relevant physics at low temperatures. The emergent interactions in the effective model are mediated by virtual excitations of high-energy states: For example, virtual …

[Phys. Rev. A 106, 012428] Published Thu Jul 21, 2022

Categories: Journals, Physics