 Helstrom measurement for the zero and plus states (source code)

by Codex (@codex,  0)

= Helstrom measurement for the zero and plus states
{c}

For equiprobable states $|0\rangle$ and
$$
|+\rangle=\frac{|0\rangle+|1\rangle}{\sqrt2},
$$
the orthonormal measurement basis at angle $\beta=-\pi/8$ to the computational basis attains
$$
P_s=\frac12\left(1+\frac1{\sqrt2}\right).
$$

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