Recently published articles in Phys. Rev. A in the Table of Content section "Quantum information"

Author(s): Cheng Xue, Xiao-Fan Xu, Yu-Chun Wu, and Guo-Ping Guo

Solving a quadratic nonlinear system of equations (QNSE) is a fundamental, but important, task in nonlinear science. We propose an efficient quantum algorithm for solving n-dimensional QNSE. Our algorithm embeds QNSE into a finite-dimensional system of linear equations using the homotopy perturbatio…

[Phys. Rev. A 106, 032427] Published Thu Sep 22, 2022

Author(s): Felipe Giraldo, Aishwarya Kumar, Tsung-Yao Wu, Peng Du, and David S. Weiss

We propose a way to measure the qubit state of an arbitrary subensemble of atoms in an array without significantly disturbing the quantum information in the unmeasured atoms. The idea is to first site-selectively transfer atoms out of the qubit basis so that one of the two states at a time is put in…

[Phys. Rev. A 106, 032425] Published Thu Sep 22, 2022

Author(s): Robert Czupryniak, Eric Chitambar, John Steinmetz, and Andrew N. Jordan

We consider the clock game–a task formulated in the framework of quantum information theory—that can be used to improve the existing schemes of quantum-enhanced telescopy. The problem of learning when a stellar photon reaches a telescope is translated into an abstract game, which we call the clock g…

[Phys. Rev. A 106, 032424] Published Wed Sep 21, 2022

Author(s): A. Sauer and J. Z. Bernád

Quantitative characterization of different entanglement detection criteria for bipartite systems is presented. We review the implication sequence of these criteria and then numerically estimate volume ratios between criteria nonviolating quantum states and all quantum states. The numerical approach …

[Phys. Rev. A 106, 032423] Published Tue Sep 20, 2022

Author(s): Aziz Karasahin, Robert M. Pettit, Nils von den Driesch, Marvin Marco Jansen, Alexander Pawlis, and Edo Waks

The authors experimentally investigate the optical properties of single chlorine donor atoms within a zinc-selenide quantum well. They show that donor-bound excitons are a stable source of single photons with a fast radiative lifetime on the order of 200 ps.

[Phys. Rev. A 106, L030402] Published Mon Sep 19, 2022

Author(s): Hanwool Lee, Kieran Flatt, Carles Roch i Carceller, Jonatan Bohr Brask, and Joonwoo Bae

In quantum state discrimination, one aims to identify unknown states from a given ensemble by performing measurements. Different strategies such as minimum-error discrimination or unambiguous state identification find different optimal measurements. Maximum-confidence measurements (MCMs) maximize th…

[Phys. Rev. A 106, 032422] Published Fri Sep 16, 2022

Author(s): Mahasweta Pandit, Chirag Srivastava, and Ujjwal Sen

Two spatially separated observers, Alice and Bob, share a bipartite two-qubit entangled state and perform measurements to witness entanglement. After their measurements, they pass their qubits to a subsequent pair of observers who try to perform the same task independently, and so on. Here we ask: w…

[Phys. Rev. A 106, 032419] Published Thu Sep 15, 2022

Author(s): Min-Quan He, Dan-Bo Zhang, and Z. D. Wang

Filter methods realize a projection from a superposed quantum state onto a target state, which can be efficient if two states have sufficient overlap. Here we propose a quantum Gaussian filter (QGF) with the filter operator being a Gaussian function of the system Hamiltonian. A hybrid quantum-classi…

[Phys. Rev. A 106, 032420] Published Thu Sep 15, 2022

Author(s): Sarah Croke

One notion of nonlocality in quantum theory is the fact that information may be encoded in a composite system in such a way that it is not accessible through local measurements, even with the assistance of classical communication. Thus, contrary to the classical case, there exists information in qua…

[Phys. Rev. A 106, 032421] Published Thu Sep 15, 2022

Author(s): Daniil Rabinovich, Soumik Adhikary, Ernesto Campos, Vishwanathan Akshay, Evgeny Anikin, Richik Sengupta, Olga Lakhmanskaya, Kirill Lakhmanskiy, and Jacob Biamonte

Variational quantum algorithms involve training parametrized quantum circuits using a classical coprocessor. An important variational algorithm, designed for combinatorial optimization, is the quantum approximate optimization algorithm. Realization of this algorithm on any modern quantum processor r…

[Phys. Rev. A 106, 032418] Published Wed Sep 14, 2022

Author(s): Guo-Zhu Song, Ming-Jie Tao, Jing Qiu, and Hai-Rui Wei

We propose two heralded schemes for generating multipartite Greenberger-Horne-Zeilinger (GHZ) and W states. They are realized by photon scattering in one-dimensional waveguides, and the qubits are encoded in the degenerate ground states of the quantum emitters. In our schemes, errors caused by the s…

[Phys. Rev. A 106, 032416] Published Tue Sep 13, 2022

Author(s): Jiawei Tan, Ligang Xiao, Daowen Qiu, Le Luo, and Paulo Mateus

Limited by today's physical devices, quantum circuits with a long depth are usually noisy and difficult to realize in practice. The novel computing architecture of distributed quantum computing is expected to reduce the noise and depth of quantum circuits. In this paper, we study Simon's problem in …

[Phys. Rev. A 106, 032417] Published Tue Sep 13, 2022

Author(s): E. R. Zinatullin, S. B. Korolev, A. D. Manukhova, and T. Yu. Golubeva

In this paper we propose two strategies for decreasing the error of arbitrary single-mode Gaussian transformations implemented using one-way quantum computation on a four-node linear cluster state. We show that it is possible to minimize the error of the arbitrary single-mode Gaussian transformation…

[Phys. Rev. A 106, 032414] Published Mon Sep 12, 2022

Author(s): Ao-Lin Guo, Tao Tu, Le-Tian Zhu, Chuan-Feng Li, and Guang-Can Guo

Hybrid systems of electron and nuclear spins are a fundamental building block for scalable quantum information processing. Here we propose a fast and high-fidelity control scheme based on geometric Landau-Zener-Stückelberg-Majorana interferometry, using a nitrogen-vacancy center in diamond as an exa…

[Phys. Rev. A 106, 032411] Published Mon Sep 12, 2022

Author(s): Jun Li and Lin Chen

We propose the notion of faithful coherent states based on the fidelity-based coherence witness. The criterion for detecting faithful coherent states can be restricted to a subclass of the fidelity-based criterion under unitary transformations for single and bipartite systems. We can realize these u…

[Phys. Rev. A 106, 032412] Published Mon Sep 12, 2022

Author(s): Zejian Li, Valentin Heyraud, Kaelan Donatella, Zakari Denis, and Cristiano Ciuti

We present a machine-learning scheme based on the relativistic dynamics of a quantum system, namely a quantum detector inside a cavity resonator. An equivalent analog model can be realized for example in a circuit QED platform subject to properly modulated driving fields. We consider a reservoir-com…

[Phys. Rev. A 106, 032413] Published Mon Sep 12, 2022

Author(s): Jeffrey H. Shapiro

In 2011, Nair published a no-go theorem for quantum radar target detection [Phys. Rev. A **84**, 032312 (2011)]. He showed, under fairly general assumptions, that a coherent-state radar's error probability was within a factor of two of the best possible quantum performance for the pure-loss (no backgrou…

[Phys. Rev. A 106, 032415] Published Mon Sep 12, 2022

Author(s): Filipe V. Melo, Nahum Sá, Itzhak Roditi, Alexandre M. Souza, Ivan S. Oliveira, Roberto S. Sarthour, and Gabriel T. Landi

We put forth a quantum simulation of a stroboscopic two-stroke thermal engine in the IBM quantum (IBMQ) processor. The system consists of a quantum spin chain connected to two baths at their boundaries, prepared at different temperatures using the variational quantum thermalizer algorithm. The dynam…

[Phys. Rev. A 106, 032410] Published Wed Sep 07, 2022

Author(s): Julien Zylberman, Giuseppe Di Molfetta, Marc Brachet, Nuno F. Loureiro, and Fabrice Debbasch

Developing numerical methods to simulate efficiently nonlinear fluid dynamics on universal quantum computers is a challenging problem. In this paper, a generalization of the Madelung transform is defined to solve quantum relativistic charged fluid equations interacting with external electromagnetic …

[Phys. Rev. A 106, 032408] Published Wed Sep 07, 2022

Author(s): A. S. Kardashin, A. V. Vlasova, A. A. Pervishko, D. Yudin, and J. D. Biamonte

In the problem of quantum channel discrimination, one distinguishes between a given number of quantum channels, which is done by sending an input state through a channel and measuring the output state. This work studies applications of variational quantum circuits and machine-learning techniques for…

[Phys. Rev. A 106, 032409] Published Wed Sep 07, 2022