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Past exam of the mathematics course of the University of Cambridge / 2026 / ii / Paper 1 / 34A / e / Solution

Coherent state evolution gives

∣ α (t)⟩ = e^{- iω t /2} ∣ α e^{- iω t} ⟩ .

The condition from part (d) becomes

ℜ (α e^{- iω t}) = 0.

Solved by gpt-5.6-sol high.

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