https://doi.org/10.1140/epjs/s11734-023-00835-3
Regular Article
Quantum correlations in dissipative gain–loss systems across exceptional points
1
Department of Physics and Materials Science, University of Luxembourg, L-1511, Luxembourg, Luxembourg
2
Department of Physics, Indian Institute of Technology, 502284, Hyderabad, India
3
Dipartimento di Fisica e Chimica-Emilio Segrè, Università degli Studi di Palermo, via Archirafi 36, 90123, Palermo, Italy
4
NEST, Istituto Nanoscienze-CNR, Piazza S. Silvestro 12, 56127, Pisa, Italy
Received:
18
November
2022
Accepted:
12
April
2023
Published online:
4
May
2023
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 (
) 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 -symmetric regime of parameters, observing how different behaviors across the EP occur only in the transient dynamics. This shows how symmetry plays a relevant role at large times.
S.I.: Recent Advances in Collective Phenomena. Guest editors: Sascha Wald, Martin Michael Möller, Christophe Chatelain.
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