q0 W q[0]
q1 W q[1]
q0 q1 G {cphase$\left(\pi/2\right)$} width=70
=
q0 G {U(0,0,$\pi/4$)} width=70
q0 +q1
q1 G {U(0,0,$-\pi/4$)} width=70
q1 G {U(0,0,$\pi/4$)} width=70