Daemonic Ergotropy: Enhanced Work Extraction from Quantum Correlations

Gianluca Francica; John Goold; Mauro Paternostro; Francesco Plastina

doi:10.1038/s41534-017-0012-8

Daemonic Ergotropy: Enhanced Work Extraction from Quantum Correlations

Gianluca Francica, John Goold, Mauro Paternostro, Francesco Plastina

School of Mathematics and Physics

Research output: Contribution to journal › Article › peer-review

112 Citations (Scopus)

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Abstract

We investigate how the presence of quantum correlations can influence work extraction in closed quantum systems, establishing a new link between the field of quantum non-equilibrium thermodynamics and the one of quantum information theory. We consider a bipartite quantum system and we show that it is possible to optimise the process of work extraction, thanks to the correlations between the two parts of the system, by using an appropriate feedback protocol based on the concept of ergotropy. We prove that the maximum gain in the extracted work is related to the existence of quantum correlations between the two parts, quantified by either quantum discord or, for pure states, entanglement. We then illustrate our general findings on a simple physical situation consisting of a qubit system.

Original language	English
Number of pages	6
Journal	npj Quantum Information
Volume	3
Early online date	23 Mar 2017
DOIs	https://doi.org/10.1038/s41534-017-0012-8
Publication status	Early online date - 23 Mar 2017

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10.1038/s41534-017-0012-8Licence: CC BY

Daemonic ergotropy: enhanced work extraction from quantum correlations
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Daemonic Ergotropy: Enhanced Work Extraction from Quantum Correlations

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