Local quantum Fisher information and local quantum uncertainty for general X states

被引：21

作者：

Yurischev, Mikhail A. ^{[1
]}

Haddadi, Saeed ^{[2
]}

机构：

[1] Russian Acad Sci, Fed Res Ctr Problems Chem Phys & Med Chem, Chernogolovka 142432, Moscow, Russia

[2] Saeeds Quantum Informat Grp, POB 19395-0560, Tehran, Iran

来源：

PHYSICS LETTERS A | 2023年 / 476卷

关键词：

Quantum correlations; Heisenberg XYZ two-qubit model; DM and KSEA interactions; X density matrix; Sudden transitions; ENTANGLEMENT; DECOHERENCE; DISCORD;

D O I：

10.1016/j.physleta.2023.128868

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A two-spin-1/2 Heisenberg XYZ model with Dzyaloshinsky-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions in the presence of an inhomogeneous external magnetic field is considered at thermal equilibrium. Its density matrix has the general X form for which we derive explicit formulas for the local quantum Fisher information (LQFI) and local quantum uncertainty (LQU) directly in terms of model parameters. This allows us to perform a comparative study for the discord-type quantum correlations LQFI and LQU and to reveal a number of new features in their behavior. In particular, the sudden transitions of quantum correlations with a smooth change in temperature are found. Moreover, it is shown that there may be a sequence of such transitions for certain choices of interaction constants.(c) 2023 Elsevier B.V. All rights reserved.

引用

页数：11

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