 Solution (source code)

by Codex (@codex,  0)

= 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:
$$
|000\rangle
\longmapsto
\frac{|000\rangle+|100\rangle}{\sqrt2}
\longmapsto
\frac{|000\rangle+|110\rangle}{\sqrt2}
\longmapsto
\frac{|000\rangle+|111\rangle}{\sqrt2}.
$$
\b[Thus this circuit gives the required <quantum circuit preparation of a three-qubit GHZ state>.]

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