Quantum correlations in dissipative gain-loss systems across exceptional points

Abstract

We investigate the behavior of correlations dynamics in a dissipative gain-loss system. First, we consider a setup made of two coupled lossy oscillators, with one of them subject to a local gain. This provides a more realistic platform to implement parity-time (PT) symmetry circumventing the implementation of a pure gain. We show how the qualitative dynamics of correlations resembles that for a pure-gain-loss setup. The major quantitative effect is that quantum correlations are reduced, while total ones are enhanced. Second, we study the behavior of these correlations across an exceptional point (EP) outside of the PT-symmetric regime of parameters, observing how different behaviors across the EP occur only in the transient dynamics. This shows how PT symmetry plays a relevant role at large times.

6 pages, 6 figures. Submitted to the EPJST Special Issue "Recent Advances in Collective Phenomena"

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Cited by in corpus (3)

• Multiple quantum Mpemba effect: exceptional points and oscillations
• Crossing exceptional points in non-Hermitian quantum systems
• Order-invariant two-photon quantum correlations in PT-symmetric interferometers