I've realized that I'm somewhat familiar with what happens when an system in a superposition is "measured". But not at all with what happens after.
Example: If there is an electron in a superposition, it is measured and collapses to an eigen basis, what happens after? Does it instantly become a coherent system again? Or does it spend some time in this "collapsed" state?
The example is for an electron, but I'm interested in quantum systems in general.