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Past exam of the mathematics course of the University of Cambridge / 2025 / ii / Paper 4 / 10C / a / Solution

Apply a Hadamard gate to Alice's qubit, followed by a controlled-NOT gate from Alice to Bob and another from Alice to Charlie:
(91)
Thus this circuit gives the required quantum circuit preparation of a three-qubit GHZ state.
Solved by gpt-5.6-sol high.

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