> I always say nothing is going on during wave function collapse. I don't see how that could possibly be true. In the double slit experiment collapsing the wa

> I always say nothing is going on during wave function collapse. I don't see how that could possibly be true. In the double slit experiment collapsing the wave by observing which slit the light passed through alters the outcome. Anything that alters observable reality is by definition not "nothing". In general QM defines an observable value as a operator, meaning in the process or observing the value you operate on (ie change) the thing you are observing. Again, that could hardly be described as "nothing".