The jumping of the quantum state to one of the eigenstates of $Q$ is the process referred to as state-vector reduction or collapse of the wave function (where $Q$ is an observable).
I used to think that the above was a reasonable definition of collapse of the wave function and the interpretations were merely explaining why this was observed? However, it seems not to be the case. Where can I read more about:
- What exactly constitutes exactly of an "interpretation of quantum mechanics"
- The interpretations of quantum mechanics