Extractable work from ensembles of quantum batteries. Entanglement helps

2012/11/19 by Robert Alicki, Mark Fannes · 9 citations
Physics and Astronomy · Mathematics · #quant-ph #math-ph #math.MP

paper · pdf · doi:10.1103/physreve.87.042123

4 pages, 1 figure, added reference, misprint corrected

arxiv created 2012/11/19 · arxiv updated 2013/05/01

Abstract

Motivated by the recent interest in thermodynamics of micro- and mesoscopic quantum systems we study the maximal amount of work that can be reversibly extracted from a quantum system used to store temporarily energy. Guided by the notion of passivity of a quantum state we show that entangling unitary controls extract in general more work than independent ones. In the limit of large number of copies one can reach the thermodynamical bound given by the variational principle for free energy.

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