Quantum discord and local demons

Details Quantum discord and local demons Quantum discord and local demons

2010-02-26

arxiv.org/abs/1002.4913v2

Phys. Rev. A 81, 062103 (2010)

Physics

Quantum Physics

7 pages, RevTeX. Some minor changes after comments from colleagues, some references added. Similar to published version

Scientific paper

10.1103/PhysRevA.81.062103

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.

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