>>15
Sz = |+><+| - |−><−|
|Sy;+> = |+>(1-i)/2 + |−>(1+i)/2
|Sy;−> = - |+>(1-i)/2 + |−>(1+i)/2
<Sy;+| = <+|(1+i)/2 + <−|(1-i)/2

<Sy;+|Sz|Sy;−> = (<+|(1+i)/2 + <−|(1-i)/2) (|+><+| - |−><−|) (- |+>(1-i)/2 + |−>(1+i)/2)
= (<+|(1+i)/2 + <−|(1-i)/2) (- |+>(1-i)/2 - |−>(1+i)/2)
= - (1-i)(1+i)/4 - (1+i)(1-i)/4 = -1
違うやん