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Feb22-12, 08:33 AM
P: 679
Quote Quote by Oudeis Eimi View Post
I believe this is only true for the simplest Fock states, i.e., those with a sharp number of quanta (eigenstates of the relevant number operator), but not for other states. For instance, <ψ>≠0 for coherent states.
I'm aware of that, but I think coherent states aren't eigenstates of time-evolution.