Undergrad Is Time Travel Possible with Entangled Particles?

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The discussion centers on the implications of entangled particles and their measurements in the context of relativity. It highlights that when two entangled particles are measured, the results are correlated, but the order of measurements can vary based on the observers' reference frames. A scenario is presented where a spaceship and Earth measure entangled particles at different times, leading to potential contradictions regarding the influence of one measurement on the other. The participants clarify that measurements are spacelike separated, meaning no definitive causal relationship exists between them, and correlations depend solely on the entangled state. Ultimately, the conversation emphasizes the complexities of quantum mechanics and relativity without allowing for faster-than-light communication.
  • #31
snuz2001 said:
So what is the answer? Can Bob’s late measurement affected Alice’s earlier?

Nobody knows the answer. At least one QM interpretation, retrocausality, allows later measurements to affect earlier ones. Nobody has found a way to experimentally test one QM interpretation vs. another, so as far as anyone knows retrocausality is still a possibility, at least in principle.

I know you would like there to be a definitive answer, but as has already been pointed out several times, this is one of those cases where we don't have one at our current state of knowledge.
 
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  • #32
The OP question has been addressed as well as it can be. Thread closed.
 

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