> In EPR, it is critical that it is the same measurement.
I must admit I haven't read the full EPR paper, only post-Bell expositions and excerpts. But you can have perfect spacelike correlations of the same measurement classically as well, e.g. if two particles having opposite (angular or linear) momenta are sent from the midpoint towards distant labs, measuring one momentum will tell you the other one. They must somehow discuss making different measurements no? Maybe they effectively discuss a protocol where the two labs agree on the same sequence of orthogonal measurements. I should read these sources sometime...
Thanks for the ftl reference. It would be astonishing if their hypotheses are borne out. I find it unlikely, but of course the experiments will have to decide, so I'll keep tabs on that. By "foliation" in this context I guess he means a foliation of spacetime amounting to an absolute reference frame. I've seen Tim Maudlin discuss something like that before.
By the way, the article you linked mentions a couple of times the importance of distinguishing signaling from causation or action, but doesn't seem to define how they're distinct. Do you know some more formal article discussing the proposed experiments? The sources given in the article are just to video interviews.
EPR's point is that there is nothing mysterious from a classical perspective of being able to deduce this. They were arguing against the presentation of QM as to there being no fact of the matter about what the momentum is before the measurement and that it randomly becomes whatever it becomes when measured. Their point is that if both particles are randomly collapsing into their choices, then they should disagree at some point unless there is some nonlocal causation happening. Einstein rejected nonlocal causation, reasonable given what he knew at the time, and thus the momentum measurement result must already be preordained by something and it is then like the classical setup.
Bell's work was to show that it had to be the nonlocal causation.
>Do you know some more formal article discussing the proposed experiments?
I do not know of an article, but Maudlin's book Quantum Non-locality and Relativity goes through the various notions of locality and what QM says about it. There is a chapter about signaling and another about causation. It also covers the GHZ scheme which is a non-probablistic version demonstrating non-locality. It is pretty clean.
>Do you know some more formal article discussing the proposed experiments?
I have not read them, but my understanding that Siddhant Das is pursuing these and here is a link to his Arxiv papers which talk about arrival time experiments though I do not know if it is directly about these.
https://arxiv.org/search/advanced?advanced=&terms-0-operator...