Related papers: Thermodynamic Roles of Quantum Environments: From Heat Baths to Work Reservoirs

Thermodynamic Roles of Quantum Environments: From Heat Baths to Work Reservoirs

URL: http://arxiv.org/abs/2408.00649v1
Date: Thu, 1 Aug 2024 15:39:06 GMT
Title: Thermodynamic Roles of Quantum Environments: From Heat Baths to Work Reservoirs
Authors: Alessandra Colla, Heinz-Peter Breuer,
Abstract summary: Environments in quantum thermodynamics usually take the role of heat baths. We show that within the same model, the environment can take three different thermodynamic roles. The exact role of the environment is determined by the strength and structure of the coupling.
Score: 49.1574468325115
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Environments in quantum thermodynamics usually take the role of heat baths. These baths are Markovian, weakly coupled to the system, and initialized in a thermal state. Whenever one of these properties is missing, standard quantum thermodynamics is no longer suitable to treat the thermodynamic properties of the system that result from the interaction with the environment. Using a recently proposed framework for open system quantum thermodynamics which is valid for arbitrary couplings and non-Markovian effects, we show that within the very same model, described by a Fano-Anderson Hamiltonian, the environment can take three different thermodynamic roles: a standard heat bath, exchanging only heat with the system, a work reservoir, exchanging only work, and a hybrid environment, providing both types of energy exchange. The exact role of the environment is determined by the strength and structure of the coupling, and by its initial state. The latter also dictates the long time behaviour of the open system, leading to thermal equilibrium for an initial thermal state and to a nonequilibrium steady state when there are displaced environmental modes.

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