Collective bath coupling lets spin ensembles reach non-thermal steady states whose energy, entropy, and free-energy changes are mitigated or amplified, with entropy production reduced by up to a factor of the ensemble size.
Characterizing irreversibility in open quantum systems
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abstract
Irreversibility is a fundamental concept with important implications at many levels. It pinpoints the fundamental difference between the intrinsically reversible microscopic equations of motion and the unidirectional arrow of time that emerges at the macroscopic level. More pragmatically, a full quantification of the degree of irreversibility of a given process can help in the characterisation of the performance of thermo-machines operating at the quantum level. Here, we review the concept of entropy production, which is commonly intended as {\it the} measure of thermodynamic irreversibility of a process, pinpointing the features and shortcomings of its current formulation.
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Thermodynamics from indistinguishability: mitigating and amplifying the effects of the bath
Collective bath coupling lets spin ensembles reach non-thermal steady states whose energy, entropy, and free-energy changes are mitigated or amplified, with entropy production reduced by up to a factor of the ensemble size.