Universal Upper Bound on Ergotropy and No-Go Theorem by the Eigenstate Thermalization Hypothesis

TL;DR

This paper establishes a universal upper limit on the work extractable from quantum many-body systems, showing that eigenstate thermalization prevents work extraction from energy eigenstates, thus reinforcing thermodynamic principles in quantum regimes.

Contribution

It introduces a universal upper bound on ergotropy based on local athermality and entropy, linking quantum thermalization to thermodynamic constraints and demonstrating a no-go theorem for work extraction.

Findings

Eigenstate thermalization prohibits work extraction from energy eigenstates.

Universal upper bound on ergotropy depends on local athermality and entropy.

Planck's principle holds even for pure quantum states.

Abstract

We show that the maximum extractable work (ergotropy) from a quantum many-body system is constrained by local athermality of an initial state and local entropy decrease brought about by quantum operations. The obtained universal upper bound on ergotropy implies that the eigenstate thermalization hypothesis prohibits work extraction from energy eigenstates by means of finite-time unitary operations. This no-go property implies that Planck's principle, a form of the second law of thermodynamics, holds even for pure quantum states. Our result bridges two independently studied concepts of quantum thermodynamics, the second law and thermalization, via intrasystem correlations in many-body systems as a resource for work extraction.