Limiting flux in quantum thermodynamics

• URL: http://arxiv.org/abs/2311.13536v1
• Date: Wed, 22 Nov 2023 17:17:23 GMT
• Title: Limiting flux in quantum thermodynamics
• Authors: Domingos S. P. Salazar
• Abstract summary: In quantum systems, entropy production is typically defined as the quantum relative entropy between two states. We propose a new upper bound for such flux in terms of quantum relative entropy, applicable even far from equilibrium and in the strong coupling regime.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In quantum systems, entropy production is typically defined as the quantum relative entropy between two states. This definition provides an upper bound for any flux (of particles, energy, entropy, etc.) of bounded observables, which proves especially useful near equilibrium. However, this bound tends to be irrelevant in general nonequilibrium situations. We propose a new upper bound for such fluxes in terms of quantum relative entropy, applicable even far from equilibrium and in the strong coupling regime. Additionally, we compare this bound with Monte Carlo simulations of random qubits with coherence, as well as with a model of two interacting nuclear spins.

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