Schrödinger Picture
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High Quality Content by WIKIPEDIA articles! In quantum mechanics, a state function is a linear combination (a superposition) of eigenstates. In the Schrödinger picture, the state of a system evolves with time, where the evolution for a closed quantum system is brought about by a unitary operator called the time-evolution operator. This differs from the Heisenberg picture where the states are constant while the observables evolve in time. The measurement statistics are the same in both pictures, as they should be. The alternative to the Schrödinger picture is to switch to a rotating reference…mehr

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High Quality Content by WIKIPEDIA articles! In quantum mechanics, a state function is a linear combination (a superposition) of eigenstates. In the Schrödinger picture, the state of a system evolves with time, where the evolution for a closed quantum system is brought about by a unitary operator called the time-evolution operator. This differs from the Heisenberg picture where the states are constant while the observables evolve in time. The measurement statistics are the same in both pictures, as they should be. The alternative to the Schrödinger picture is to switch to a rotating reference frame, which is itself being rotated by the propagator. Since the undulatory rotation is now being assumed by the reference frame itself, an undisturbed state function appears to be truly static. This is the Heisenberg picture.