Entropy dynamics of a dephasing model in a squeezed thermal bath

Yi-Ning You and Sheng-Wen Li
Phys. Rev. A 97, 012114 – Published 16 January 2018

Abstract

We study the entropy dynamics of a dephasing model, where a two-level system (TLS) is coupled with a squeezed thermal bath via a nondemolition interaction. This model is exactly solvable, and the time-dependent states of both the TLS and its bath can be obtained exactly. Based on these states, we calculate the entropy dynamics of both the TLS and the bath, and find that the dephasing rate of the system relies on the squeezing phase of the bath. In the zero-temperature and high-temperature limits, both the system and bath entropy increase monotonically in the coarse-grained time scale. Moreover, we find that the dephasing rate of the system relies on the squeezing phase of the bath, and this phase dependence cannot be precisely derived from the Born-Markovian approximation which is widely adopted in open quantum systems.

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  • Received 21 September 2017

DOI:https://doi.org/10.1103/PhysRevA.97.012114

©2018 American Physical Society

Physics Subject Headings (PhySH)

Quantum Information, Science & TechnologyStatistical Physics & ThermodynamicsGeneral Physics

Authors & Affiliations

Yi-Ning You1,2 and Sheng-Wen Li1,*

  • 1Texas A&M University, College Station, Texas 77843, USA
  • 2University of Science and Technology of China, Hefei, Anhui 230026, China

  • *lishengwen@tamu.edu

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Issue

Vol. 97, Iss. 1 — January 2018

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