Quantum correlations in PT-symmetric systems

被引：25

作者：

Roccati, Federico ^{[1
]}

Lorenzo, Salvatore ^{[1
]}

Massimo Palma, G. ^{[1
,2
]}

Landi, Gabriel T. ^{[3
]}

Brunelli, Matteo ^{[4
]}

Ciccarello, Francesco ^{[1
,2
]}

机构：

[1] Univ Palermo, Dipartimento Fis & Chim Emilio Segre, Via Archirafi 36, I-90123 Palermo, Italy

[2] CNR, Ist Nanosci, NEST, Piazza S Silvestro 12, I-56127 Pisa, Italy

[3] Univ Sao Paulo, Inst Fis, BR-05314970 Sao Paulo, SP, Brazil

[4] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

QUANTUM SCIENCE AND TECHNOLOGY | 2021年 / 6卷 / 02期

基金：

欧盟地平线“2020”;

关键词：

PT symmetry; quantum correlations; non-Hermitian; quantum discord; DISCORD;

D O I：

10.1088/2058-9565/abcfcc

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the dynamics of correlations in a paradigmatic setup to observe PT-symmetric physics: a pair of coupled oscillators, one subject to a gain one to a loss. Starting from a coherent state, quantum correlations (QCs) are created, despite the system being driven only incoherently, and can survive indefinitely. Both total and QCs exhibit different scalings of their long-time behavior in the PT-broken/unbroken phase and at the exceptional point (EP). In particular, PT symmetry breaking is accompanied by non-zero stationary QCs. This is analytically shown and quantitatively explained in terms of entropy balance. The EP in particular stands out as the most classical configuration, as classical correlations diverge while QCs vanish.

引用

页数：12

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