Positive operator-valued measure
= Positive operator-valued measure
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A positive operator-valued measure is a family of positive operators $E_i$ satisfying $\sum_iE_i=I$. It determines measurement probabilities $\Pr(i)=\operatorname{Tr}(E_i\rho)$; choosing measurement operators with $E_i=M_i^\dagger M_i$ additionally determines state updates.
= POVM
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