Fluctuation-dissipation relations for thermodynamic distillation processes

Abstract

The fluctuation-dissipation theorem is a fundamental result in statistical physics that establishes a connection between the response of a system subject to a perturbation and the fluctuations associated with observables in equilibrium. Here we derive its version within a resource-theoretic framework, where one investigates optimal quantum state transitions under thermodynamic constraints. More precisely, we first characterise optimal thermodynamic distillation processes, and then prove a relation between the amount of free energy dissipated in such processes and the free energy fluctuations of the initial state of the system. Our results apply to initial states given by either asymptotically many identical pure systems or arbitrary number of independent energy-incoherent systems, and allow not only for a state transformation, but also for the change of Hamiltonian. The fluctuation-dissipation relations we derive enable us to find the optimal performance of thermodynamic protocols such as work extraction, information erasure and thermodynamically-free communication, up to second-order asymptotics in the number $N$ of processed systems. We thus provide a first rigorous analysis of these thermodynamic protocols for quantum states with coherence between different energy eigenstates in the intermediate regime of large but finite $N$.

arXiv comment31 pages, 7 figures. Published version

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• Boosting Biomolecular Switch Efficiency With Quantum Coherence
• Optimal performance of a three stroke heat engine in the microscopic regime
• Quantum dichotomies and coherent thermodynamics beyond first-order asymptotics
• Thermodynamic criteria for signaling in quantum channels
• Minimizing Dissipation via Interacting Environments: Quadratic Convergence to Landauer Bound
• Thermodynamic Constraints on Information Transmission in Quantum Ensembles
• Finite-size catalysis in quantum resource theories