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Article

Diagnosing Thermality from Geometric Observables

2026-04-10

Abstract excerpt

We address the problem of determining whether a given mixed quantum state corresponds to thermal equilibrium or to a zero-temperature statistical mixture. We show that geometric observables, in particular the quantum Fisher information, provide a direct diagnostic criterion. Thermal states satisfy fluctuation–response relations linking energy variance to parameter sensitivity, while generic mixed states do not. Th...

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Identifiers and source

Literature Corpus work
6aba9ef4-5062-5fe5-9fc7-af592dfb2e1e
DOI
10.20944/preprints202604.0687.v1
Open publication

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Diagnosing Thermality from Geometric ObservablesDOI 10.20944/preprints202604.0687.v1
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