What has confused me for a long time is the interaction between superposition and entanglement. That is, what happens when one member of a pair of entangled particles passes through a filter that selects for an observable that is incompatible to the observable in which the pair is entangled? Say we have a pair of particles entangled in some observable A, so that one is definitely in the state A+ and the other is definitely in the state A-, we just don't know yet which is which. Let one of those particles pass through a filter that collapses the wave function of the particle to a definite state of B, an observable incompatible to A, and that resulting B particle is then passed through an A filter that collapses the wave function to a definite state of A which we also do not yet know. Now we look at both particles, the one original and the one passed through the filters. What state pairs will we see for this pair of particles? Will we ever see ++ or --? If we do, then it would seem that collapsing the wave function to a definite state of B severs the entanglement in A between the first two, original particles. My question is: Do the results of actual experiments indicate that the entanglement is severed in this situation or does it survive so that we still will only see +- & -+ state pairs? Based on posts I've read, it seems that the entanglement will be severed but I'm just not sure I've correctly interpreted what I've read.