Past exam of the mathematics course of the University of Cambridge / 2022 / ii / Paper 2 / 15D / a / i

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- Solution i

Solution

A Bell measurement is the projective measurement of two qubits in the orthonormal Bell state basis

∣ ϕ^{\pm} ⟩ = \frac{∣00 ⟩ \pm ∣11 ⟩}{2}, ∣ ψ^{\pm} ⟩ = \frac{∣01 ⟩ \pm ∣10 ⟩}{2} .

Its four classical outcomes identify the corresponding rank-one projector.

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