Quantum discord and local demons
arXiv:1002.4913 · doi:10.1103/PhysRevA.81.062103
Abstract
Quantum discord was proposed as a measure of the "quantumness" of correlations. There are at least three different discord-like quantities, two of which determine the difference between the efficiencies of a Szilard's engine under different sets of restrictions. The three discord measures vanish simulataneosly. We introduce an easy way to test for zero discord, relate it to the Cerf-Adami conditional entropy and show that there is no relation between the discord and the local disitnguishability.
7 pages, RevTeX. Some minor changes after comments from colleagues, some references added. Similar to published version
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- Spacetime structure and vacuum entanglement
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