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Open Quantum Systems Decoherence

Local master equations may fail to describe dissipative critical behavior

arXiv
Authors: Michael Konopik, Eric Lutz

Year

2020

Paper ID

18302

Status

Preprint

Abstract Read

~2 min

Abstract Words

111

Citations

N/A

Abstract

Local quantum master equations provide a simple description of interacting subsystems coupled to different reservoirs. They have been widely used to study nonequilibrium critical phenomena in open quantum systems. We here investigate the validity of such a local approach by analyzing a paradigmatic system made of two harmonic oscillators each in contact with a heat bath. We evaluate the steady-state mean occupation number for varying temperature differences and find that local master equations generally fail to reproduce the results of an exact quantum-Langevin-equation description. We relate this property to the inability of the local scheme to properly characterize intersystem correlations, which we quantify with the help of the quantum mutual information.

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  • This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
  • It adds a 2020 reference point for readers tracking recent quantum research.
  • Local quantum master equations provide a simple description of interacting subsystems coupled to different reservoirs.

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