- #1

- 11

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_{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??