Suppose that a quanton's energy is zero, irrespective of its spin orientation. Suppose further that we prepare this quanton in an arbitrary spin state $|\psi(0)\rangle$. The probability of any possible experimental outcome for any spin observable will then be independent of time.

Question

Quizplus · Accepted Answer

The time evolution of a quantum state is governed by the Schrödinger equation, and if the energy of the quanton is zero, the state will not evolve with time. Therefore, the probability of any experimental outcome for any spin observable, which depends on the state of the system, will remain constant over time.

Suppose That a Quanton's Energy Is Zero, Irrespective of Its ∣ψ(0)⟩|\psi(0)\rangle∣ψ(0)⟩

Suppose That a Quanton's Energy Is Zero, Irrespective of Its $|\psi(0)\rangle$