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The [[conditional quantum entropy]] is an [[entropy measure]] used in [[quantum information theory]]. It is a generalization of the [[conditional entropy]] of [[classical information theory]]. The conditional entropy is written <math>S(\rho|\sigma)</math>, or <math>H(\rho|\sigma)</math>, depending on the notation being used for the [[von Neumann entropy]].
For the remainder of the article, we use the notation <math>S(\rho)</math> for the von Neumann entropy.
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