Good answers. Just a small comment: quantum entropy is a generalization of class... | Hacker News

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		sinesha on April 17, 2014 \| parent \| context \| favorite \| on: Quantum Entanglement Drives the Arrow of Time Good answers. Just a small comment: quantum entropy is a generalization of classical entropy. In particular, if A and B are classically correlated, then S(A\|B) has all the properties of a classical entropy (Shannon's, in this case), for instance, it is non-negative.

tedsanders on April 17, 2014 [–]

What does classically correlated mean? Is it different than quantum correlated? (Is this analogous to the difference between pure and mixed states?)

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