Quantum correlations in PT-symmetric systems

Gioacchino Massimo Palma, Francesco Ciccarello, Federico Roccati, Salvatore Lorenzo, Francesco Ciccarello, Matteo Brunelli, Gabriel T. Landi, G. Massimo Palma

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Abstract

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.
Original languageEnglish
Number of pages12
JournalQuantum Science and Technology
Volume6
Publication statusPublished - 2021

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering

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