Quantum Discord and Maxwell's Demons
arXiv:quant-ph/0301127 · doi:10.1103/PhysRevA.67.012320
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.
This is the final version of quant-ph/0202123, to appear in Physical Review A