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For a signal to time travel, it needs to travel faster than the speed of light. Now there is an experiment to try this out.
For a signal to time travel, it needs to travel faster than the speed of light. Now there is an experiment to try this out.
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Because these two photons are entangled, the act of detecting the second as either a wave or a particle should simultaneously force the other photon to also change into either a wave or a particle. But that would have to happen to the first photon before it hits its detector -- which it will hit 50 microseconds before the second photon is detected. That is what quantum mechanics predicts should happen. And if it does, signaling would have gone backward in time relative to the first photon.