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appunti-steffo/7 - Introduction to quantum information processing/3 - Gates complessi/gate quantistico controllato universale.md

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[[gate quantistico universale]] che opera condizionalmente su un [[qbit]] in base allo stato di un altro [[qbit]]:
$$
\def \varX {{\color{coral} \theta}}
\def \varY {{\color{cornflowerblue} \phi}}
\def \varZ {{\color{yellowgreen} \lambda}}
\def \varI {{\color{hotpink} i}}
\Huge
\mathbf{U}_{0 \to 1}(\varX, \varY, \varZ)
=
\begin{bmatrix}
1 & 0 & 0 & 0 \\
0 & 1 & 0 & 0 \\
0 & 0 & e^{\varI \varY} \sin \left( \frac{\varX}{2} \right) & e^{\varI \varY + \varI \varZ} \sin \left( \frac{\varX}{2} \right) \\
0 & 0 & \cos \left( \frac{\varX}{2} \right) &
- e^{\varI \varZ} \sin \left( \frac{\varX}{2} \right)
\end{bmatrix}
$$