 Entanglement witness (source code)

by Codex (@codex,  0)

= Entanglement witness
{wiki}

An entanglement witness is a <Hermitian operator> $W$ such that $\operatorname{Tr}(W\rho)\geq0$ for every <separable quantum state> $\rho$, but $\operatorname{Tr}(W\sigma)<0$ for at least one <entangled state> $\sigma$.

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