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Open Quantum Systems Decoherence

The fate of dynamical phase transitions at finite temperatures and in open systems

arXiv
Authors: N. Sedlmayr, M. Fleischhauer, J. Sirker

Year

2017

Paper ID

24846

Status

Preprint

Abstract Read

~2 min

Abstract Words

108

Citations

N/A

Abstract

When a quantum system is quenched from its ground state, the time evolution can lead to non-analytic behavior in the return rate at critical times tc. Such dynamical phase transitions (DPT's) can occur, in particular, for quenches between phases with different topological properties in Gaussian models. In this paper we discuss Loschmidt echos generalized to density matrices and obtain results for quenches in closed Gaussian models at finite temperatures as well as for open system dynamics described by a Lindblad master equation. While cusps in the return rate are always smoothed out by finite temperatures we show that dissipative dynamics can be fine-tuned such that DPT's persist.

Why This Paper Matters

  • This paper contributes to the Open Quantum Systems & Decoherence research area in the Quantum Articles archive.
  • It adds a 2017 reference point for readers tracking recent quantum research.
  • When a quantum system is quenched from its ground state, the time evolution can lead to non-analytic behavior in the return rate at critical times tc.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1711.10381 [2] arXiv https://arxiv.org/abs/1711.10381 [3] Publisher https://arxiv.org/abs/1711.10381

Local Citation Graph (Related-Paper Links)

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