Entanglement Generation is Not Necessary for Optimal Work Extraction

TitleEntanglement Generation is Not Necessary for Optimal Work Extraction
Publication TypeJournal Article
Year of Publication2013
AuthorsHovhannisyan, K, Perarnau-Llobet, M, Huber, M, Acín, A
JournalPhysical Review Letters
Date Published12/2013

We consider reversible work extraction from identical quantum batteries. From an ensemble of individually passive states, work can be produced only via global unitary (and thus entangling) operations. However, we show here that there always exists a method to extract all possible work without creating any entanglement, at the price of generically requiring more operations (i.e. additional time). We then study faster methods to extract work and provide a quantitative relation between the amount of generated multipartite entanglement and extractable work. Our results suggest a general relation between entanglement generation and the power of work extraction.

Short TitlePhys. Rev. Lett.
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