Thermodynamical Detection of Entanglement by Maxwell's Demons

Details Thermodynamical Detection of Entanglement by Maxwell's Demons Thermodynamical Detection of Entanglement by Maxwell's Demons

2003-11-12

arxiv.org/abs/quant-ph/0311083v3

PRA 71, 012108 (2005)

Physics

Quantum Physics

5 pages, 4 figures. v3: a figure added, a few refs added, & typos corrected

Scientific paper

10.1103/PhysRevA.71.012108

Quantum correlation, or entanglement, is now believed to be an indispensable physical resource for certain tasks in quantum information processing, for which classically correlated states cannot be useful. Besides information processing, what kind of physical processes can exploit entanglement? In this paper, we show that there is indeed a more basic relationship between entanglement and its usefulness in thermodynamics. We derive an inequality showing that we can extract more work out of a heat bath via entangled systems than via classically correlated ones. We also analyze the work balance of the process as a heat engine, in connection with the Second Law of thermodynamics.

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