Discord and non-classicality in probabilistic theories

Details Discord and non-classicality in probabilistic theories Discord and non-classicality in probabilistic theories

2011-12-21

arxiv.org/abs/1112.5066v1

Physics

Quantum Physics

5 pages, revtex style

Scientific paper

Quantum discord quantifies non-classical correlations in quantum states. We introduce discord for states in causal probabilistic theories, inspired by the original definition proposed in Ref. [17]. We show that the only probabilistic theory in which all states have null discord is classical probability theory. Non-null discord is then not just a quantum feature, but a generic signature of non-classicality.

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