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I'm stuck with a simple and stupid question...

We have a spin "up" and "down" as a qubit 1 and 0 states.

Now can we consider a state perpendicular to this basis direction as a (0+1)/sqrt(2) state?

If not then what is the sence of the phase shift x in the state (0+exp(ix)1)/sqrt(2)?

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# Spins as qubits

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