Broadcast copies reveal the quantumness of correlations

Details Broadcast copies reveal the quantumness of correlations Broadcast copies reveal the quantumness of correlations

2009-01-09

arxiv.org/abs/0901.1280v2

Phys. Rev. Lett. 102, 250503 (2009)

Physics

Quantum Physics

1 figure, 5 pages, more similar to the published version

Scientific paper

10.1103/PhysRevLett.102.250503

We study the quantumness of bipartite correlations by proposing a quantity that combines a measure of total correlations -- mutual information -- with the notion of broadcast copies -- i.e., generally nonfactorized copies -- of bipartite states. By analyzing how our quantity increases with the number of broadcast copies, we are able to classify classical, separable, and entangled states. This motivates the definition of the broadcast regularization of mutual information, the asymptotic minimal mutual information per broadcast copy, which we show to have many properties of an entanglement measure.

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