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Spin Rotation

  1. Jul 8, 2010 #1
    Hi there!
    If I have an electron in the spin state |+> and I rotate it by an angle of 360°, then the state becomes -|+>. Now, if I want to find the probability of measuring the spin up, I have:
    So after a rotation of 360° I have a negative probability??
  2. jcsd
  3. Jul 8, 2010 #2
    Ok.. I found the error!! I have to consider the square of -1 which is 1... really a stupid error :blushing:
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