System-bath entanglement during Markovian relaxation of a fermionic impurity

• URL: http://arxiv.org/abs/2306.08626v2
• Date: Thu, 2 Nov 2023 16:26:17 GMT
• Title: System-bath entanglement during Markovian relaxation of a fermionic impurity
• Authors: Krzysztof Ptaszynski, Massimiliano Esposito
• Abstract summary: We show that transient entanglement can be observed even in the weak coupling regime. This entanglement vanishes for long times, but is preserved over timescales comparable to the relaxation time. We relate the presence of such transient entanglement to the unitary character of the system-bath dynamics underlying the reduced Markovian description.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate the dynamics of entanglement between the system and the environment during thermalization of a noninteracting fermionic impurity coupled to a fermionic thermal bath. We show that transient entanglement can be observed even in the weak coupling regime, when the reduced dynamics and thermodynamics of the system can be well described by an effectively classical and Markovian master equation for the state populations. This entanglement vanishes for long times, but is preserved over timescales comparable to the relaxation time. Its magnitude depends only weakly on the system-environment coupling but instead strongly on the purity of the initial state of the system. We relate the presence of such transient entanglement to the unitary character of the system-bath dynamics underlying the reduced Markovian description.

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