Perceived contradiction in non-locality principle

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The discussion centers on the perceived contradiction in the non-locality principle regarding polarization-entangled photons measured by Alice and Bob. It highlights the confusion over how the polarization states of photons A and B relate to each other after measurement, questioning whether one measurement influences the other. Participants clarify that while there is a correlation between the measurements, it is incorrect to assert that one photon's state causes the other's due to the nature of quantum mechanics. The conversation also touches on the implications of relativity, emphasizing that the order of measurements cannot be definitively established. Ultimately, the discussion underscores the complexity of interpreting entanglement and measurement in quantum mechanics without definitive causal relationships.
  • #61
.Scott said:
That lack of time-based cause and effect is the core reason for taking the entire measurement process as one fully-integrated event.
Lets say you measure one particle from entangled pair and then depending from the measurement result you decide to perform or not perform entanglement swapping of second particle with a particle from another entangled pair.
Can you take it as one fully-integrated event?
 
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  • #62
zonde said:
Lets say you measure one particle from entangled pair and then depending from the measurement result you decide to perform or not perform entanglement swapping of second particle with a particle from another entangled pair.
Can you take it as one fully-integrated event?
Well, you can. But that makes things too easy. Normally you want to keep one measurement from having an obvious influence on the other so that there is no "hidden value" solution.
Perhaps more importantly, the measurement of just one particle is "random", he equivalent of a coin flip. It is only when you have a population of A measurements to compare to a corresponding population of B measurements that you see a pattern.
 

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