Entanglement generation is not necessary for optimal work extraction

Karen V. Hovhannisyan, Martí Perarnau-Llobet, Marcus Huber, Antonio Acín

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129 Citations (Scopus)


We consider reversible work extraction from identical quantum systems. 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. © 2013 American Physical Society.
Original languageEnglish
Article number240401
JournalPhysical Review Letters
Issue number24
Publication statusPublished - 9 Dec 2013

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