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arXiv · 2102.07348

Lower Bound on Irreversibility in Thermal Relaxation of Open Quantum Systems

Tan Van Vu·Yoshihiko Hasegawa
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Abstract

We consider thermal relaxation process of a quantum system attached to a single or multiple reservoirs. Quantifying the degree of irreversibility by entropy production, we prove that the irreversibility of the thermal relaxation is lower-bounded by a relative entropy between the unitarily-evolved state and the final state. The bound characterizes the state discrepancy induced by the non-unitary dynamics, thus reflecting the dissipative nature of irreversibility. Intriguingly, the bound can be evaluated solely in terms of the initial and final states and the system Hamiltonian; hence, providing a feasible way to estimate entropy production without prior knowledge of the underlying coupling structure. Our finding refines the second law of thermodynamics and reveals a universal feature of thermal relaxation processes.

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Tan Van Vu, Yoshihiko Hasegawa. 2021-10-14. Lower Bound on Irreversibility in Thermal Relaxation of Open Quantum Systems. https://doi.org/10.1103/physrevlett.127.190601

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