Talk:Conditional quantum entropy
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Notation change[edit]
I've changed the notation from S(rho | sigma) to S(A|B)_rho. This notation makes it clear that the conditional quantum entropy is defined in terms of a single state (rho) with two subsystems (A,B), whereas the old notation was ambiguous, by not specifying the joint density matrix. Also, the notation I've introduced is now the standard used; e.g. see the Horodecki-Oppenheim-Winter paper cited in the current article. Aram.harrow (talk) 03:04, 17 September 2012 (UTC)