Quantum logic gate
= Quantum logic gate
{title2=$U^\dagger U=I$}
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= Quantum gate
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A unitary operation on a fixed number of <qubits> used as a component of a <quantum circuit>. Examples include the <Hadamard gate> and <Controlled-Z gate>. Measurements are described separately by <quantum measurement>; a gate is a reversible operation on its full input state.