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Introducing Quantum Discord

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.

preprint2001arXivOpen access
Harold OllivierWojciech H. Zurek
quant-ph
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Harold OllivierWojciech H. Zurek

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