PRA: Quantum information

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Recently published articles in Phys. Rev. A in the Table of Content section "Quantum information"
Updated: 14 min 13 sec ago

Timelike correlations and quantum tensor product structure

Wed, 2022-12-07 11:00

Author(s): Samrat Sen, Edwin Peter Lobo, Ram Krishna Patra, Sahil Gopalkrishna Naik, Anandamay Das Bhowmik, Mir Alimuddin, and Manik Banik

The state-space structure for a composite quantum system is postulated among several mathematically consistent possibilities that are compatible with a local quantum description. For instance, the unentangled Gleason's theorem allows a state space that includes density operators as a proper subset a…


[Phys. Rev. A 106, 062406] Published Wed Dec 07, 2022

Categories: Journals, Physics

Nonlinear flip-flop quantum walks through potential barriers

Wed, 2022-12-07 11:00

Author(s): F. S. Passos and A. R. C. Buarque

The dynamics of nonlinear flip-flop quantum walk with amplitude-dependent phase shifts with pertubing potential barrier is investigated. Through the adjustment between uniform local perturbations and a Kerr-like nonlinearity of the medium we find a rich set of dynamic profiles. We will show the exis…


[Phys. Rev. A 106, 062407] Published Wed Dec 07, 2022

Categories: Journals, Physics

Effect of Wigner rotation on estimating the unitary-shift parameter of a relativistic spin-1/2 particle

Mon, 2022-12-05 11:00

Author(s): Shin Funada and Jun Suzuki

We obtain the accuracy limit for estimating the expectation value of the position of a relativistic particle for an observer moving in one direction at a constant velocity. We use a specific model of a relativistic spin-1/2 particle described by a Gaussian wave function with a spin down in the rest …


[Phys. Rev. A 106, 062404] Published Mon Dec 05, 2022

Categories: Journals, Physics

Detecting quantum phase transition via magic resource in the $XY$ spin model

Mon, 2022-12-05 11:00

Author(s): Shuangshuang Fu, Xiaohui Li, and Shunlong Luo

Quantum phase transition in the XY spin model with three-spin interaction is investigated using magic resource (non-stabilizerness), which is crucial in universal fault-tolerant quantum computation. The magic quantifier we employ here is defined straightforwardly via characteristic functions of quan…


[Phys. Rev. A 106, 062405] Published Mon Dec 05, 2022

Categories: Journals, Physics

Scalable quantum control and non-Abelian anyon creation in the Kitaev honeycomb model

Fri, 2022-12-02 11:00

Author(s): Omar Raii, Florian Mintert, and Daniel Burgarth

The Kitaev honeycomb model is a system allowing for experimentally realizable quantum computation with topological protection of quantum information. Practical implementation of quantum information processing typically relies on adiabatic, i.e., slow dynamics. Here we show that the restriction to ad…


[Phys. Rev. A 106, 062401] Published Fri Dec 02, 2022

Categories: Journals, Physics

Dark path holonomic qudit computation

Fri, 2022-12-02 11:00

Author(s): Tomas André and Erik Sjöqvist

Nonadiabatic holonomic quantum computation is a method used to implement high-speed quantum gates with non-Abelian geometric phases associated with paths in state space. Due to their noise tolerance, these phases can be used to construct error resilient quantum gates. We extend the holonomic dark pa…


[Phys. Rev. A 106, 062402] Published Fri Dec 02, 2022

Categories: Journals, Physics

Spin-orbit maximally discordant mixed states

Fri, 2022-12-02 11:00

Author(s): D. G. Braga, I. Fonseca, W. F. Balthazar, M. S. Sarandy, and J. A. O. Huguenin

We introduce a proposal to prepare spin-obit maximally discordant mixed states by a linear optical circuit, with quantum bits (qubits) encoded in the polarization and transverse mode degrees of freedom of photons. In particular, we discuss how to prepare nonbalanced spin-orbit entangled states, appl…


[Phys. Rev. A 106, 062403] Published Fri Dec 02, 2022

Categories: Journals, Physics

Controlled quantum teleportation in the presence of an adversary

Wed, 2022-11-30 11:00

Author(s): Sayan Gangopadhyay, Tiejun Wang, Atefeh Mashatan, and Shohini Ghose

We present a device-independent analysis of controlled quantum teleportation where the receiver is not trusted. We show that the notion of genuine tripartite nonlocality allows us to certify control power in such a scenario. By considering a specific adversarial attack strategy on a device character…


[Phys. Rev. A 106, 052433] Published Wed Nov 30, 2022

Categories: Journals, Physics

Theory of entanglement and measurement in high-order harmonic generation

Wed, 2022-11-30 11:00

Author(s): Philipp Stammer

Quantum information science and intense laser driven processes are apparently two unrelated fields. In this work, the author theoretically studies how conditioning protocols for quantum state engineering of light have their roots in the quantum theory of measurement, and how this allows one to obtain nonclassical states of light using the process of high-order harmonic generation.


[Phys. Rev. A 106, L050402] Published Wed Nov 30, 2022

Categories: Journals, Physics

Quantifying coherence in terms of Fisher information

Tue, 2022-11-29 11:00

Author(s): Deng-hui Yu and Chang-shui Yu

In quantum metrology, the parameter estimation accuracy is bounded by quantum Fisher information. In this paper we present coherence measures in terms of (quantum) Fisher information by directly considering the postselective nonunitary parametrization process. This coherence measure demonstrates the…


[Phys. Rev. A 106, 052432] Published Tue Nov 29, 2022

Categories: Journals, Physics

Quantum computing fidelity susceptibility using automatic differentiation

Mon, 2022-11-28 11:00

Author(s): Olivia Di Matteo and R. M. Woloshyn

Automatic differentiation is an invaluable feature of machine learning and quantum machine learning software libraries. In this work, it is shown how quantum automatic differentiation can be used to solve the condensed-matter problem of computing fidelity susceptibility, a quantity whose value may b…


[Phys. Rev. A 106, 052429] Published Mon Nov 28, 2022

Categories: Journals, Physics

Entanglement entropy scaling of noisy random quantum circuits in two dimensions

Mon, 2022-11-28 11:00

Author(s): Meng Zhang, Chao Wang, Shaojun Dong, Hao Zhang, Yongjian Han, and Lixin He

Whether noisy quantum devices without error correction can provide quantum advantage over classical computers is a critical issue of current quantum computation. In this work, the random quantum circuits, which are used as the paradigm model to demonstrate quantum advantage, are simulated with depol…


[Phys. Rev. A 106, 052430] Published Mon Nov 28, 2022

Categories: Journals, Physics

Alternatives to a nonhomogeneous partial differential equation quantum algorithm

Mon, 2022-11-28 11:00

Author(s): Alexandre C. Ricardo, Gabriel P. L. M. Fernandes, Eduardo I. Duzzioni, Vivaldo L. Campo, and Celso J. Villas-Boas

Recently, J. M. Arrazola et al. [Phys. Rev. A 100, 032306 (2019)] proposed a quantum algorithm for solving nonhomogeneous linear partial differential equations of the form Aψ(r)=f(r). Its nonhomogeneous solution is obtained by inverting the operator  along with the preparation and measurement of …


[Phys. Rev. A 106, 052431] Published Mon Nov 28, 2022

Categories: Journals, Physics

Quantum metrology with delegated tasks

Wed, 2022-11-23 11:00

Author(s): Nathan Shettell and Damian Markham

A quantum metrology scheme can be decomposed into three quantum tasks: state preparation, parameter encoding, and measurements. Consequently, it is imperative to have access to the technologies which can execute the aforementioned tasks to fully implement a quantum metrology scheme. In the absence o…


[Phys. Rev. A 106, 052427] Published Wed Nov 23, 2022

Categories: Journals, Physics

Symmetry-protected entanglement in random mixed states

Wed, 2022-11-23 11:00

Author(s): Kasra Hejazi and Hassan Shapourian

Symmetry is an important property of quantum mechanical systems which may dramatically influence their behavior in and out of equilibrium. In this paper, we study the effect of symmetry on tripartite entanglement properties of typical states in symmetric sectors of Hilbert space. In particular, we c…


[Phys. Rev. A 106, 052428] Published Wed Nov 23, 2022

Categories: Journals, Physics

Mimicking quantum correlation of a long-range Hamiltonian by finite-range interactions

Tue, 2022-11-22 11:00

Author(s): Leela Ganesh Chandra Lakkaraju, Srijon Ghosh, Debasis Sadhukhan, and Aditi Sen(De)

The quantum long-range extended Ising model possesses several striking features which cannot be observed in the corresponding short-range model. We report that the pattern obtained from the entanglement between any two arbitrary sites of the long-range model can be mimicked by the model having a fin…


[Phys. Rev. A 106, 052425] Published Tue Nov 22, 2022

Categories: Journals, Physics

Quantum energy landscape and circuit optimization

Tue, 2022-11-22 11:00

Author(s): Joonho Kim and Yaron Oz

We study the effects of entanglement and control parameters on the symmetry of the energy landscape and optimization performance of the variational quantum circuit. Through a systematic analysis of the Hessian spectrum, we characterize the local geometry of the energy landscape at a random point and…


[Phys. Rev. A 106, 052424] Published Tue Nov 22, 2022

Categories: Journals, Physics

Topology identification of autonomous quantum dynamical networks

Tue, 2022-11-22 11:00

Author(s): Stefano Gherardini, Henk J. van Waarde, Pietro Tesi, and Filippo Caruso

Topology identification comprises reconstructing the Hamiltonian, and thus the corresponding interaction terms, by properly processing measurements of its density operator within a fixed time interval. It finds application in several quantum technology contexts, ranging from quantum communication to…


[Phys. Rev. A 106, 052426] Published Tue Nov 22, 2022

Categories: Journals, Physics

Noisy quantum kernel machines

Fri, 2022-11-18 11:00

Author(s): Valentin Heyraud, Zejian Li, Zakari Denis, Alexandre Le Boité, and Cristiano Ciuti

In the noisy intermediate-scale quantum era, an important goal is the conception of implementable algorithms that exploit the rich dynamics of quantum systems and the high dimensionality of the underlying Hilbert spaces to perform tasks while prescinding from noise-proof physical systems. An emergin…


[Phys. Rev. A 106, 052421] Published Fri Nov 18, 2022

Categories: Journals, Physics

Hamiltonian-based data loading with shallow quantum circuits

Fri, 2022-11-18 11:00

Author(s): Bojia Duan and Chang-Yu Hsieh

Data loading with shallow quantum circuits is a highly desirable ingredient for efficient execution of many quantum algorithms before large-scale quantum error corrections with full fault tolerance become readily available. The need for efficient data loading is especially urgent for the study of qu…


[Phys. Rev. A 106, 052422] Published Fri Nov 18, 2022

Categories: Journals, Physics