Intrinsic Hamiltonian of Mean Force and Strong-Coupling Quantum Thermodynamics

• URL: http://arxiv.org/abs/2506.02888v1
• Date: Tue, 03 Jun 2025 13:54:07 GMT
• Title: Intrinsic Hamiltonian of Mean Force and Strong-Coupling Quantum Thermodynamics
• Authors: Ignacio González, Sagnik Chakraborty, Ángel Rivas,
• Abstract summary: We present a universal thermodynamic framework for quantum systems strongly coupled to thermal environments.<n>We preserve the same gauge freedoms as in the standard weak-coupling regime and retain the von Neumann expression for thermodynamic entropy.<n>We validate the framework by applying it to a paradigmatic model of strong coupling with a structured bosonic reservoir.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present a universal thermodynamic framework for quantum systems that may be strongly coupled to thermal environments. Unlike previous approaches, our method enables a clear definition of thermostatic properties while preserving the same gauge freedoms as in the standard weak-coupling regime and retaining the von Neumann expression for thermodynamic entropy. Furthermore, it provides a formulation of general first and second laws using only variables accessible through microscopic control of the system, thereby enhancing experimental feasibility. We validate the framework by applying it to a paradigmatic model of strong coupling with a structured bosonic reservoir.

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