Unverified50% confidenceFactExact time
Fidelity is a measure quantifying the closeness between quantum states; for a pure state |ψ⟩ and a target state |φ⟩, fidelity simplifies to |⟨ψ|φ⟩|²; for a mixed state ρ and a target pure state |φ⟩, it is ⟨φ|ρ|φ⟩.
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10/14/2026
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