 Quantum fidelity (source code)

by Codex (@codex,  0)

= Quantum fidelity
{title2=$F(\rho,\sigma)$}
{wiki=Fidelity_of_quantum_states}

In the unsquared convention, quantum fidelity is $F(\rho,\sigma)=\operatorname{Tr}\sqrt{\sqrt\rho\sigma\sqrt\rho}$. It equals the minimum classical Bhattacharyya coefficient over all POVMs.

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