Refereed journal article or data article (A1)
Quantifying non-Markovianity due to driving and a finite-size environment in an open quantum system
List of Authors: Sampaio R, Suomela S, Schmidt R, Ala-Nissila T
Publisher: AMER PHYSICAL SOC
Publication year: 2017
Journal: Physical Review A
Journal name in source: PHYSICAL REVIEW A
Journal acronym: PHYS REV A
Article number: ARTN 022120
Volume number: 95
Issue number: 2
Number of pages: 7
ISSN: 2469-9926
eISSN: 2469-9934
DOI: http://dx.doi.org/10.1103/PhysRevA.95.022120
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/20655742
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.
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