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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Non-Markovianity through flow of information between a system and an environment

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Haseli, S. [1] ; Karpat, G. [2] ; Salimi, S. [1] ; Khorashad, A. S. [1] ; Fanchini, F. F. [2] ; Cakmak, B. [2] ; Aguilar, G. H. [3] ; Walborn, S. P. [3] ; Souto Ribeiro, P. H. [3]
Total Authors: 9
[1] Univ Kurdistan, Dept Phys, Sanandaj - Iran
[2] Univ Estadual Paulista, UNESP, Fac Ciencias, BR-17033360 Bauru, SP - Brazil
[3] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Physical Review A; v. 90, n. 5 NOV 24 2014.
Web of Science Citations: 40

Exchange of information between a quantum system and its surrounding environment plays a fundamental role in the study of the dynamics of open quantum systems. Here we discuss the role of the information exchange in the non-Markovian behavior of dynamical quantum processes following the decoherence approach, where we consider a quantum system that is initially correlated with its measurement apparatus, which in turn interacts with the environment. We introduce away of looking at the information exchange between the system and environment using the quantum loss, which is shown to be closely related to the measure of non-Markovianity based on the quantum mutual information. We also extend the results of Fanchini et al. {[}Phys. Rev. Lett. 112, 210402 (2014)] in several directions, providing a more detailed investigation of the use of the accessible information for quantifying the backflow of information from the environment to the system. Moreover, we reveal a clear conceptual relation between the entanglement-and mutual-information-based measures of non-Markovianity in terms of the quantum loss and accessible information. We compare different ways of studying the information flow in two theoretical examples. We also present experimental results on the investigation of the quantum loss and accessible information for a two-level system undergoing a zero temperature amplitude damping process. We use an optical approach that allows full access to the state of the environment. (AU)

FAPESP's process: 12/18558-5 - Studying the monogamic relations between entanglement and quantum correlations
Grantee:Goktug Karpat
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 12/50464-0 - A study of quantum correlations in open quantum systems
Grantee:Felipe Fernandes Fanchini
Support type: Regular Research Grants