Just reviewing some QM again and I think I'm forgetting something basic. Just consider a qubit with basis {(adsbygoogle = window.adsbygoogle || []).push({}); 0,1}. On the one hand I thought0and -0are NOT the same state as demonstrated in interference experiments, but on the other hand the literature seems to say the state space is projective 2D complex Hilbert space and that cS=Sfor any stateSand complex scalar c.

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# 2D Projective Complex Space, Spin

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