Can quantum entanglement be used to communicate with people from the future/past?

Question

Quantum entanglement describes situations where particles mirror each other instantaneously, regardless of the distances between the two.

If quantum entanglement communication would work for particles over huge distances, wouldn't it be possible to communicate with entangled particles across different times? Since space and time are interwoven like a "fabric", if particles are able to mirror each other across one medium, wouldn't they be able to do so on the other?

Answer 1

You can't use quantum entanglement for any form of communications.



As soon as you deliberate change one of the entangled objects (e.g. set it to 0 or 1 as part of a digital message) this *destroys* the entanglement.

Answer 2

No.



No communication of information is allowed by entanglement. No effect transfers between physically separate entangled particles. It is forbidden by both special relativity and the ‘no communication’ theorem in quantum mechanics. The no communication theorem - which is fairly conceptually complicated - basically says that if a measurement is made on one entangled particle, the measurement on the second entangled particle cannot distinguish whether the first measurement was made or not made. If you cannot tell there was a change of state of the first particle, then you cannot communicate a state change to the second particle.

Answer 3

Actually no. What is not mentioned often enough is that when the state of an entangled quantum is changed, that destroys the entanglement. So the pair can no longer be used. So we could see a quantum flip state once and that's all. Hardly communication.



There have been schemes wherein three entangled quanta have been proposed to teleport one of the quanta over great distances. It's a bit convoluted and messy, but the bottom line is that the original quantum is destroyed in the process and only a copy of it is teleported (so to speak). It's certainly not "Beam me up Scottie."

Answer 4

No. There's that annoyingly second law of thermodynamics, entropy and the butterfly effect and chaos theory and the Heisenberg uncertainty principle interfering.