An argument against the realistic interpretation of the wave function

Understand

Testable predictions of quantum mechanics are invariant under time reversal.

• But the change of the quantum state in time is not so, neither in the collapse nor in the no-collapse interpretations of the theory.
• This fact challenges the realistic interpretation of the quantum state.
• On the other hand, this fact follows easily if we interpret the quantum state as a mere calculation device, bookkeeping past real quantum events.