The exchange of information between an open quantum system and its environment allows us to discriminate among different kinds of dynamics, in particular detecting memory effects to characterize non-Markovianity. Here, we investigate the role played by the system-environment correlations and the environmental evolution in the flow of information. First, we derive general conditions ensuring that two generalized dephasing microscopic models of the global system-environment evolution result exactly in the same open-system dynamics, for any initial state of the system. Then, we use the trace distance to quantify the distinct contributions to the information inside and outside the open system in the two models. Our analysis clarifies how the interplay between system-environment correlations and environmental-state distinguishability can lead to the same information flow from and toward the open system, despite significant qualitative and quantitative differences at the level of the global evolution.

On the connection between microscopic description and memory effects in open quantum system dynamics / A. Smirne, N. Megier, B. Vacchini. - In: QUANTUM. - ISSN 2521-327X. - 5(2021 Apr 26), pp. 439.1-439.12. [10.22331/q-2021-04-26-439]

On the connection between microscopic description and memory effects in open quantum system dynamics

A. Smirne
Primo
;
B. Vacchini
Ultimo
2021-04-26

Abstract

The exchange of information between an open quantum system and its environment allows us to discriminate among different kinds of dynamics, in particular detecting memory effects to characterize non-Markovianity. Here, we investigate the role played by the system-environment correlations and the environmental evolution in the flow of information. First, we derive general conditions ensuring that two generalized dephasing microscopic models of the global system-environment evolution result exactly in the same open-system dynamics, for any initial state of the system. Then, we use the trace distance to quantify the distinct contributions to the information inside and outside the open system in the two models. Our analysis clarifies how the interplay between system-environment correlations and environmental-state distinguishability can lead to the same information flow from and toward the open system, despite significant qualitative and quantitative differences at the level of the global evolution.
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
Settore FIS/03 - Fisica della Materia
PSR2015-1718BVACC_01 - PIANO DI SOSTEGNO ALLA RICERCA 2015-2017 - TRANSITION GRANT LINEA 1A PROGETTO "UNIMI PARTENARIATI H2020" - VACCHINI, BASSANO MARIA - PSR2015-17 - Piano di sviluppo di ricerca 2015-17 - 2018
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/859322
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