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Title: Quantifying non-Markovianity due to driving and a finite-size environment in an open quantum system
Authors: Sampaio, Rui
Suomela, Samu
Schmidt, Rebecca
Ala-Nissila, Tapio
Issue Date: 2017
Publisher: © American Physical Society
Citation: SAMPAIO, R., 2017. Quantifying non-Markovianity due to driving and a finite-size environment in an open quantum system. Physical Review A: Atomic, Molecular and Optical Physics, 95: 022120.
Abstract: © 2017 American Physical Society.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)PRLTAO0031-900710.1103/PhysRevLett.103.210401]. 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.
Description: This paper was accepted for publication in the journal Physical Review A and the definitive published version is available at https://doi.org/10.1103/PhysRevA.95.022120
Version: Published
DOI: 10.1103/PhysRevA.95.022120
URI: https://dspace.lboro.ac.uk/2134/28171
Publisher Link: https://doi.org/10.1103/PhysRevA.95.022120
ISSN: 1094-1622
Appears in Collections:Published Articles (Maths)

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