σ(adsbygoogle = window.adsbygoogle || []).push({}); _{x}|x>=+|x>

σ_{x}|-x>=-|-x>

These equations also follows for σ_{y}and σ_{z}corresponds states |y> and |z>.

if we measure along axis X then X state vector let it go which means up spin and opposite not go through which means down spin.

and also same for y and z axis.

But,

σ_{x}|u>=|d> σ_{x}|d>=|u>

σ_{y}|u>=i|d> σ_{y}|d>=-i|u>

σ_{z}|u>=|u> σ_{z}|d>=-|d>

these 3 equations cant make any sense to me. i cant draw any physical meaning to these equations.

here 1st equation shows if up spin electron goes through along X axis then after measurement spin wilbe down.but this up electron has to be up for any specific axis??right?? without axis up down is unmeaningfull.isn't it??

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# Spin operator

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