[jostylr]

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...

[griffzhowl]

Thanks, I had a look at Maudlin's book. It seems the distinction between signaling and causation is that there might be some kind of nonlocal causation that we can't control and so can't use to send a signal.

Local causation is defined as in Bell's Theory of Local Beables, as the probability distribution for values at spacelike separated regions only being correlated with respect to the overlaps in their past lightcones. Or to put it the other way around, there's nonlocal causation if the probability distribution of values in one region depends on values in a spacelike separated region. That's what I'd call nonlocal correlation rather than causation but I guess that's just terminological.

This looks like a pertinent paper from Das but I haven't read through it yet

Arrival Time Distributions of Spin-1/2 Particles (2018) https://arxiv.org/abs/1802.07141