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i was corrected, and told that the wiki article supporting what i had said was wrong, and pointed at some papers referring to current experiments with photon-photon collisions.

so, apparently, photons can collide with each other, but i simply cannot understand how that corresponds with what i have been taught, regarding the photon probability function and no precise location of a photon. for photons to collide, they must have some precise location, but to have a location, the probability function must be collapsed, which seems in conflict with the basic premise of QED.

can someone please try to provide some explanation of this for me? what am i misunderstanding? thanks.