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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.
Why This Paper Matters
- 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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