Below is a copy of a answer given to this Phys.SE question asked previously: Does every material thing just consist in forces?
In short, assume that we have two labs A and B, in each one there is a polarizer, and each one of the photons flies toward such a lab. Assume that in the lab A the experimenter orientates the polarizer in some direction, picked by him arbitrarily. Assume that in the lab B the experimenter orientates the polarizer by chance in the same direction. Then, what happens is that in the lab A the photon passes the polarizer, so does the photon in the lab B. But if in the lab A the photon doesn't pass, neither does the photon in the lab B. And the labs are far from one another?
Which force acts between the two photons so as to correlate their actions? If one photon behaved in a certain way, passed or not the polarizer, how does it influence the other photon to behave the same way? We don't know. And take into account that by the time the two photons leave the source, the experimenters in the two places, may not have even decided in which directions to orientate the polarizers.
Is this answer an informal description of non-locality?
And if it is, how do we know that (any) force is involved in non-locality?