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Quantum Non-Markovian Environment-to-System Backflows of Information: Nonoperational vs. Operational Approaches

Authors :
Adrián A. Budini
Source :
Entropy, Vol 24, Iss 5, p 649 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

Quantum memory effects can be qualitatively understood as a consequence of an environment-to-system backflow of information. Here, we analyze and compare how this concept is interpreted and implemented in different approaches to quantum non-Markovianity. We study a nonoperational approach, defined by the distinguishability between two system states characterized by different initial conditions, and an operational approach, which is defined by the correlation between different outcomes associated to successive measurement processes performed over the system of interest. The differences, limitations, and vantages of each approach are characterized in detail by considering diverse system–environment models and dynamics. As a specific example, we study a non-Markovian depolarizing map induced by the interaction of the system of interest with an environment characterized by incoherent and coherent self-dynamics.

Details

Language :
English
ISSN :
10994300
Volume :
24
Issue :
5
Database :
Directory of Open Access Journals
Journal :
Entropy
Publication Type :
Academic Journal
Accession number :
edsdoj.ffc2e7513f994f8c891293222bea9ed7
Document Type :
article
Full Text :
https://doi.org/10.3390/e24050649