Journal
PHYSICAL REVIEW A
Volume 67, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.67.012320
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Quantum discord was proposed as an information-theoretic measure of the quantumness of correlations. I show that discord determines the difference between the efficiency of quantum and classical Maxwell's demons-that is, entities that can or cannot measure nonlocal observables or carry out conditional quantum operations-in extracting work from collections of correlated quantum systems.
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