New answers tagged unitarity
0
You can use $Ry$ (y-rotation gate). Its general matrix is
$$
Ry(\theta) =
\begin{pmatrix}
\cos(\theta/2) & -\sin(\theta/2) \\
\sin(\theta/2) & \cos(\theta/2)
\end{pmatrix}
$$
Applying the gate on $|0\rangle$ state, you get a state
$$
|\psi\rangle = \cos(\theta/2)|0\rangle + \sin(\theta/2)|1\rangle
$$
Hence $\cos(\theta/2) = \frac{1}{\sqrt{3}}$ ...
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