Undergrad General argument that entanglement can only be created locally

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Entanglement is primarily created locally, such as through the generation of photon pairs in a crystal, although entanglement swapping can occur later. The discussion highlights that while entanglement can be established through local measurements, the phenomenon of entanglement swapping introduces non-local correlations, challenging the notion of locality. Participants argue about the implications of entangled photons that have never interacted and the role of measurement in establishing entanglement. The conversation emphasizes the need for a deeper understanding of quantum mechanics, particularly regarding the nature of entanglement and the timing of measurements. Overall, the complexities of entanglement and its implications for locality remain a significant topic of debate in quantum physics.
  • #31
DrChinese said:
So how is 1,4 entanglement being created when 1,2,3,4 are all distant from each other?
Note that this question assumes realism--that entanglement is something that has to be "created". In other words, it is interpretation dependent, as @Cthugha has pointed out.
 
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  • #32
greypilgrim said:
As far as I know, entanglement can initially only be created locally
As the discussion here has shown, this is not true, in the sense that two particles can be entangled without ever having undergone a common local interaction. That is an experimental fact.

How that fact is interpreted is a matter of QM interpretation, and discussion of that, as has been remarked, belongs in the interpretations subforum.

And with that, this thread is closed. Thanks to all who participated.
 
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