|q⟩
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Multiple choice
Postulate 1 says a quantum system is described by a unit state vector. Two state vectors
∣
ψ
⟩
|\psi\rangle
∣
ψ
⟩
and
e
i
γ
∣
ψ
⟩
e^{i\gamma}|\psi\rangle
e
iγ
∣
ψ
⟩
that differ only by an overall phase represent what?
The same physical state, since no measurement can distinguish them
Two orthogonal states that can be perfectly distinguished
States related by a measurement collapse
States with different total probabilities
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