From the postulates of QM we know that any state |ψ> is the same as exp(iθ)|ψ>.(adsbygoogle = window.adsbygoogle || []).push({});

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?

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# Help with simple question

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