A theory is, light particles can act in reverse time. Two subatomic particles do seem to communicate with each other regardless of how far apart they get in space & time. Its a theory that rests on a sort of time travel called Quantum Retrocausality. A backward concept that time can go backwards. Lasers, prisms, splitters, & fiber-optic cables can be used to detect non-local signaling between entangled photons. Experimenting with those and the above light particles just might work. What do you think?