TL;DR
This paper investigates how different types of correlations in quantum systems influence the maximum work extractable, revealing that discord correlations uniquely enhance work extraction while others may hinder it.
Contribution
The study introduces correlation quantifiers based on ergotropy and analyzes their impact on work extraction in quantum thermodynamics.
Findings
Discord correlations always positively contribute to work extraction.
Total, classical, and entanglement correlations can reduce the ergotropy.
The paper provides a new perspective on the role of correlations in quantum thermodynamics.
Abstract
Understanding the role of classical and quantum correlations in work extraction is a problem of fundamental importance in thermodynamics. We approach this problem by considering that, in closed quantum systems, the maximum cyclic work extractable is equal to the ergotropy. Thus, we aim to identify and investigate the contributions to the ergotropy coming from different kinds of initial correlations (total, classical, discord and entanglement correlations). By doing so, we have introduced and studied quantifiers of correlations which are based on ergotropy. In particular, our results suggest that only discord correlations always give a positive contribution to work extraction, while total, classical and entanglement correlations can reduce the work extraction.
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