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Daemonic Ergotropy: Generalised Measurements and Multipartite Settings

Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, 57068 Siegen, Germany
School of Mathematics and Physics, Queen’s University, Belfast BT7 1NN, UK
Author to whom correspondence should be addressed.
Entropy 2019, 21(8), 771;
Received: 6 July 2019 / Revised: 31 July 2019 / Accepted: 3 August 2019 / Published: 7 August 2019
PDF [404 KB, uploaded 14 August 2019]


Recently, the concept of daemonic ergotropy has been introduced to quantify the maximum energy that can be obtained from a quantum system through an ancilla-assisted work extraction protocol based on information gain via projective measurements [G. Francica et al., npj Quant. Inf. 3, 12 (2018)]. We prove that quantum correlations are not advantageous over classical correlations if projective measurements are considered. We go beyond the limitations of the original definition to include generalised measurements and provide an example in which this allows for a higher daemonic ergotropy. Moreover, we propose a see-saw algorithm to find a measurement that attains the maximum work extraction. Finally, we provide a multipartite generalisation of daemonic ergotropy that pinpoints the influence of multipartite quantum correlations, and study it for multipartite entangled and classical states. View Full-Text
Keywords: ergotropy; quantum correlations; information thermodynamics ergotropy; quantum correlations; information thermodynamics

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Bernards, F.; Kleinmann, M.; Gühne, O.; Paternostro, M. Daemonic Ergotropy: Generalised Measurements and Multipartite Settings. Entropy 2019, 21, 771.

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