i want to get a better understanding of quantum mechanics (specifically for the multiple particle case) and came to a point where looking deeper into the theory won't yield the answers i seek. so to my discomfort i fear i'd need to look at experimental results to extend my understanding. so my first question simple interference experiments should hopefully answer. there are a lot of experiments that use half mirrors to split up a particle to conduct self-interference with it later in one way or another (e.g. quantum bomb tester). i am looking for experiments that instead of the half mirror splitting use another independent particle of same type for the interference instead. i imagine it might be difficult to consistently produce pairs of particles of the same wavelength and phase to yield proper interference results but i suppose there are enough tricky physicist that got it done one way or another. any links would by helpful, thanks.