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Supremacy of the quantum many-body Szilard engine with attractive bosons


Ett samarbete mellan forskare vid Matematisk fysik och Fasta tillståndets fysik (samt internationella kollegor) har lett till en artikel som just blivit accepterad för publikation i Physical Review Letters. Forskningen finansieras av ett KAW-projekt (coord. H. LInke) och VR.

Artikel är "Supremacy of the quantum many-body Szilard engine with attractive bosons", av Jakob Bengtsson, Mikael Nilsson Tengstrand, Andreas Wacker, Peter Samuelsson, Masahito Ueda, Heiner Linke och Stephanie M. Reimann, accepterad för publikation i Physical Review Letters.

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Boosted information-work conversion with attractive bosons The Szilard engine has been a paradigm in thermodynamics for more than 80 years because of the way it illustrates and interrelates fundamental aspects of work, heat and information. However, so far it has been a mystery if - and how - interactions in a many-body quantum system influence the operation of this heat engine. In our Letter, we show that in fact, such interactions - which are next to unavoidable in an experimental realization of the engine - significantly alter the information-to-work output. Specifically, we show that the work output of a Szilard engine containing a quantum gas of attractive bosons is superior to that generated by an engine containing non-interacting particles and that this supremacy increases significantly with particle number. We also show that the work output reaches a maximum at a finite temperature, which is surprising given the quantum nature of this effect. Our work demonstrates an intricate interplay between quantum mechanics, thermodynamics and information theory and sheds light on a hitherto unexplored fundamental question that is relevant for a wide range of many-body quantum systems where interactions are important.