Refereed journal article or data article (A1)
Non-Markovian Quantum Dynamics in a Squeezed Reservoir
List of Authors: Link Valentin, Strunz Walter T, Luoma Kimmo
Publisher: MDPI
Publication year: 2022
Journal: Entropy
Journal name in source: ENTROPY
Journal acronym: ENTROPY-SWITZ
Volume number: 24
Issue number: 3
Number of pages: 13
DOI: http://dx.doi.org/10.3390/e24030352
URL: https://doi.org/10.3390/e24030352
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/69091760
Abstract
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.
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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