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Spin observables

  1. Nov 1, 2008 #1
    What is the criterion to define the reference axes, since $S_x$, $S_y$ and $S_z$ correspond to different Pauli matrices?
  2. jcsd
  3. Nov 1, 2008 #2
    I found the answer: In the theory the ladder operators are defined as

    S_{\pm} \equiv S_x \pm iS_y.

    That is, they act on the z direction.
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