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Quantum Interpretations and Foundations
Can Special Relativity Explain the Alice and Bob Spin Measurement Paradox?
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[QUOTE="vanhees71, post: 6823794, member: 260864"] ad 1) I have repeatedly argued that also entanglement swapping doesn't imply any non-local causal influences. The entanglement swapping is by selecting events based on measurements on entangled systems, i.e., the entanglement of the corresponding subensembles is as well explained by the entanglement of the original systems, and this entanglement was due to the preparation of these systems. I don't know, what you'd accept as empirical evidence for the locality of interactions. The point is that with local relativistic QFT we have a theory, where all interactions are local, and today there's not a single experiment violating the predictions of local relativistic QFT, i.e., all phenomena can explained with this kind of theory, which is consistent with the relativistic causality structure of spacetime. ad 2) Now you contradict yourself. In your posting before you emphasized the finite extension of the "wave packets". Now you make a point about the localization of the photons. Indeed what's "localized" are the detection events at A's and B's detectors, and these can indeed by space-like separated, which excludes a causal influence of one of these events on the other, and this assumption is usually made by all experimenters performing such experiments, and this is indeed justified, because these experiments are in accordance with local relativistic QFT! If you deny the validity of the locality (microcausality) principle, you also deny the validity of this argument, which for sure is not denied in all papers on the subject I'm aware of. The experiments are also independent, as has been demonstrated by randomly choosing the observable measured at A's and B's place independently, again in a way, where relativistic causality excludes a mutual causal influence of one of these choices on the other. 3) As I said before, any paper I know, take the locality assumption as an argument rather than denying it. I think this is once more a misunderstanding, because you don't accept the precise definition of locality as used in relativistic QFT, but I defined precisely what I mean by locality, namely the validity of the microcausality condition for local observables. [/QUOTE]
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Can Special Relativity Explain the Alice and Bob Spin Measurement Paradox?
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