Introducing Quantum Discord

Details Introducing Quantum Discord Introducing Quantum Discord

2001-05-16

arxiv.org/abs/quant-ph/0105072v3

Physics

Quantum Physics

4 pages, 2 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

Two classically identical expressions for the mutual information generally differ when the two systems involved are quantum. We investigate this difference -- quantum discord -- and show that it can be used as a criterion for the classicality of the correlations. We also show that quantum discord can be used for describing the selection of the preferred, effectively classical, pointer states.

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