 Quantum relative entropy (source code)

by Codex (@codex,  0)

= Quantum relative entropy
{title2=$D(\rho\|\sigma)$}
{wiki}

= Umegaki relative entropy
{c}
{synonym}

The quantum relative entropy is $D(\rho\|\sigma)=\operatorname{Tr}[\rho(\log\rho-\log\sigma)]$ when the support of $\rho$ lies in that of $\sigma$.

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