Estimate Re(⟨ψ|U|ψ⟩) for U=Z gate and |ψ⟩=|+⟩ using a single ancilla qubit.
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Updated
Feb 19, 2026 - OpenQASM
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ancilla
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Measure |⟨ψ|φ⟩|² between two quantum states using a Fredkin (controlled-SWAP) gate.
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Updated
Feb 19, 2026 - OpenQASM
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