- #1
deneve
- 37
- 0
From the postulates of QM we know that any state |ψ> is the same as exp(iθ)|ψ>.
Ok so take the spin state of an electron in the x direction and expand in the z basis to get
|+x> = 1/sqrt2(|+> + |->)
= 1/sqrt2(|+> + exp(iθ) |->) using the above,
choosing theta =∏
|+x> =1/sqrt2(|+> +(-1)|->)
=1/sqrt2(|+> - |->)
=|-x>
which can't be right?
Ok so take the spin state of an electron in the x direction and expand in the z basis to get
|+x> = 1/sqrt2(|+> + |->)
= 1/sqrt2(|+> + exp(iθ) |->) using the above,
choosing theta =∏
|+x> =1/sqrt2(|+> +(-1)|->)
=1/sqrt2(|+> - |->)
=|-x>
which can't be right?