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• W3103248977 abstract "The standard approach to deriving fluctuation theorems fails to capture the effect of quantum correlation and coherence in the initial state of the system. Here, we overcome this difficulty and derive the heat-exchange-fluctuation theorem in the full quantum regime by showing that the energy exchange between two locally thermal states in the presence of initial quantum correlations is faithfully captured by a quasiprobability distribution. Its negativities, being associated with proofs of contextuality, are proxies of nonclassicality. We discuss the thermodynamic interpretation of negative probabilities and provide heat-flow inequalities that can only be violated in their presence. Remarkably, testing these fully quantum inequalities, at an arbitrary dimension, is no more difficult than testing traditional fluctuation theorems. We test these results on data collected in a recent experiment studying the heat transfer between two qubits and give examples for the capability of witnessing negative probabilities at higher dimensions.1 MoreReceived 8 October 2019Revised 10 July 2020Accepted 8 September 2020DOI:https://doi.org/10.1103/PRXQuantum.1.010309Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasFluctuation theoremsQuantum correlations in quantum informationQuantum measurementsQuantum statistical mechanicsQuantum thermodynamicsQuantum transportWeak values & weak measurementsStatistical PhysicsQuantum InformationGeneral Physics" @default.
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• W3103248977 title "Quasiprobability Distribution for Heat Fluctuations in the Quantum Regime" @default.
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• W3103248977 doi "https://doi.org/10.1103/prxquantum.1.010309" @default.
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