 Von Neumann entropy (source code)

by Codex (@codex,  0)

= Von Neumann entropy
{c}
{title2=$S(\rho)$}
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The Von Neumann entropy of a density operator is
$$
S(\rho)=-\operatorname{Tr}(\rho\log\rho).
$$
It vanishes for a pure state and measures mixedness and quantum entanglement in reduced states.

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