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A brief introduction to observational entropy

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arxiv 2008.04409 v2 pith:5A6NSWD7 submitted 2020-08-10 quant-ph cond-mat.quant-gascond-mat.stat-mech

Dominik Šafránek , Anthony Aguirre , Joseph Schindler , J. M. Deutsch This is my paper · ORCID
classification quant-phcond-mat.quant-gascond-mat.stat-mech
keywords entropyframeworkobservationalquantumaimedapplicationsbeenboltzmann
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In the past several years, observational entropy has been developed as both a (time-dependent) quantum generalization of Boltzmann entropy, and as a rather general framework to encompass classical and quantum equilibrium and non-equilibrium coarse-grained entropy. In this paper we review the construction, interpretation, most important properties, and some applications of this framework. The treatment is self-contained and relatively pedagogical, aimed at a broad class of researchers.

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  1. Work and entropy of mixing in isolated quantum systems

    quant-ph 2025-07 conditional novelty 6.0 of 10

    Mixing entropy is identified with observational entropy, yielding a Landauer-like work-difference bound with an observational temperature, and a resolution of the Gibbs mixing paradox in isolated quantum systems.

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