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How would you go about finding the probabilities?

Asked by maxyfox 3 months ago,

If you've got a half spin system, and it's in the state of:

|phi = ((1+I)/rot(3)) |+ + (1/rot(3)) |-

(sorry about the |x I can't find a better way to show kets)

How would you go about finding the probabilities of plus or minus h(bar) / 2?
When...

measuring the spin in the z-direction?

Thx.

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How would you go about finding the probabilities?