Abstract
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.
- Received 3 September 2002
DOI:https://doi.org/10.1103/PhysRevA.67.012320
©2003 American Physical Society
