 Breidbart basis (source code)

by Codex (@codex,  0)

= Breidbart basis
{c}

The Breidbart basis bisects the computational and diagonal qubit bases. For equiprobable $|0\rangle$ and $|-\rangle$, whose overlap magnitude is $1/\sqrt2$, it realizes the Helstrom measurement and succeeds with probability
$$
\frac12\left(1+\frac1{\sqrt2}\right)=\cos^2\frac\pi8.
$$

This intermediate basis occurs in attacks and discrimination calculations involving <BB84>.

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