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Informational Work Storage in Quantum Thermodynamics

Department of Physics, Tamkang University, New Taipei City 25137, Taiwan
Quantum Reports 2019, 1(1), 37-49; https://doi.org/10.3390/quantum1010005
Received: 18 April 2019 / Revised: 22 May 2019 / Accepted: 30 May 2019 / Published: 4 June 2019
We present a critical examination of the difficulties with the quantum versions of a lifted weight that are widely used as work storage systems in quantum thermodynamics. To overcome those difficulties, we turn to the strong connections between information and thermodynamics illuminated by Szilard’s engine and Landauer’s principle, and consider the concept of informational work storage. This concept is in sharp contrast with the usual one of mechanical work storage underlying the idealization of a quantum weight. An informational work storage system based on maximally mixed qubits that does not act as an entropy sink and is capable of truly distinguishing work from heat is studied. Applying it to the problem of single-shot work extraction in various extraction schemes, we show that for a given system state the maximum extractable work is independent of extraction scheme, in accordance with the second law of thermodynamics. View Full-Text
Keywords: quantum thermodynamics; work extraction and storage; thermodynamic resource theory quantum thermodynamics; work extraction and storage; thermodynamic resource theory
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Wang, S.-Y. Informational Work Storage in Quantum Thermodynamics. Quantum Reports 2019, 1, 37-49.

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