Quantum correlations in PT-symmetric systems

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 surviv...

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Bibliographic Details
Published in:Quantum science and technology 2021-04, Vol.6 (2), p.25005
Main Authors: Roccati, Federico, Lorenzo, Salvatore, Massimo Palma, G, Landi, Gabriel T, Brunelli, Matteo, Ciccarello, Francesco
Format: Article
Language:English
Subjects:
non-Hermitian
PT symmetry
quantum correlations
quantum discord
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Summary: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.
ISSN:2058-9565
2058-9565
DOI:10.1088/2058-9565/abcfcc