Non-Markovian Quantum Dynamics in a Squeezed Reservoir

We study non-Markovian dynamics of an open quantum system system interacting with a nonstationary squeezed bosonic reservoir. We derive exact and approximate descriptions for the open system dynamics. Focusing on the spin boson model, we compare exact dynamics with Redfield theory and a quantum opti...

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Detalles Bibliográficos
Autores principales: Link, Valentin, Strunz, Walter T., Luoma, Kimmo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8946918/
https://www.ncbi.nlm.nih.gov/pubmed/35327864
http://dx.doi.org/10.3390/e24030352
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author Link, Valentin
Strunz, Walter T.
Luoma, Kimmo
author_facet Link, Valentin
Strunz, Walter T.
Luoma, Kimmo
author_sort Link, Valentin
collection PubMed
description We study non-Markovian dynamics of an open quantum system system interacting with a nonstationary squeezed bosonic reservoir. We derive exact and approximate descriptions for the open system dynamics. Focusing on the spin boson model, we compare exact dynamics with Redfield theory and a quantum optical master equation for both short and long time dynamics and in non-Markovian and Markov regimes. The squeezing of the bath results in asymptotic oscillations in the stationary state, which are captured faithfully by the Redfield master equation in the case of weak coupling. Furthermore, we find that the bath squeezing direction modifies the effective system–environment coupling strength and, thus, the strength of the dissipation.
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spelling pubmed-89469182022-03-25 Non-Markovian Quantum Dynamics in a Squeezed Reservoir Link, Valentin Strunz, Walter T. Luoma, Kimmo Entropy (Basel) Article We study non-Markovian dynamics of an open quantum system system interacting with a nonstationary squeezed bosonic reservoir. We derive exact and approximate descriptions for the open system dynamics. Focusing on the spin boson model, we compare exact dynamics with Redfield theory and a quantum optical master equation for both short and long time dynamics and in non-Markovian and Markov regimes. The squeezing of the bath results in asymptotic oscillations in the stationary state, which are captured faithfully by the Redfield master equation in the case of weak coupling. Furthermore, we find that the bath squeezing direction modifies the effective system–environment coupling strength and, thus, the strength of the dissipation. MDPI 2022-02-28 /pmc/articles/PMC8946918/ /pubmed/35327864 http://dx.doi.org/10.3390/e24030352 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Link, Valentin
Strunz, Walter T.
Luoma, Kimmo
Non-Markovian Quantum Dynamics in a Squeezed Reservoir
title Non-Markovian Quantum Dynamics in a Squeezed Reservoir
title_full Non-Markovian Quantum Dynamics in a Squeezed Reservoir
title_fullStr Non-Markovian Quantum Dynamics in a Squeezed Reservoir
title_full_unstemmed Non-Markovian Quantum Dynamics in a Squeezed Reservoir
title_short Non-Markovian Quantum Dynamics in a Squeezed Reservoir
title_sort non-markovian quantum dynamics in a squeezed reservoir
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8946918/
https://www.ncbi.nlm.nih.gov/pubmed/35327864
http://dx.doi.org/10.3390/e24030352
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