Recent content by philo324

Wait, I think I see from some other postings. The mixed states really are a different case, more like statistical mechanics.

Clear. I'm thinking about a state that evolves in time, for example. Like if you had the square well problem but your system was in more than one energy state, so the state evolves as the mean value sloshes back and forth in time. Is that a superposition of say pure energy eigenstates or is it a...

I am a little bit versed in the formalism of Hilbert space, the state vector and the matricies and their eigenvector basis of observables in QM. I understand that a pure state in one observable basis may be (is) a superposition in another basis (spin xUP) is superposition of spinyUP, spin yDOWN...