Quantifying non-Markovianity due to driving and a finite-size environment in an open quantum system

Rui Ferreira Sampaio, Samu Suomela, Rebecca Schmidt, Tapio Ala-Nissilä

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Abstract

We study non-Markovian effects present in a driven qubit coupled to a finite environment using a recently proposed model developed in the context of calorimetric measurements of open quantum systems. To quantify the degree of non-Markovianity we use the Breuer-Laine-Piilo (BLP) measure [H.-P. Breuer, Phys. Rev. Lett. 103, 210401 (2009)]. We show that information backflow only occurs in the case of driving, in which case we investigate the dependence of memory effects on the environment size, driving amplitude, and coupling to the environment. We show that the degree of non-Markovianity strongly depends on the ratio between the driving amplitude and the coupling strength. We also show that the degree of non-Markovianity does not decrease monotonically as a function of the environment size.

Original languageEnglish
Article number022120
Pages (from-to)1-7
Number of pages7
JournalPhysical Review A
Volume95
Issue number2
DOIs
Publication statusPublished - 21 Feb 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • THERMODYNAMICS

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