On Fri, Nov 22, 2024 at 9:33 AM John Clark <[email protected]> wrote:
> On Mon, Nov 18, 2024 at 1:03 AM Bruce Kellett <[email protected]> > wrote: > > *> The violation of Bell inequalities implies non-locality,* >> > > *No, that's an oversimplification. The violation of Bell's Inequalitie > implies that things are either non-local and realistic, or local and > unrealistic. Many Worlds is local and unrealistic. * > > >> *> and the epistemic interpretation of the wave function is perfectly >> compatible with non-locality.* >> > > *True, there could still be hidden variables, but they would be non-local > hidden variables. * > > *> Unfortunately, Everettian QM, or MWI, cannot even account for the >> correlations, much less the violations of the Bell inequalities. * >> > > *The spin of 2 electrons has been quantum mechanically entangled. One > electron is given to Alice and the other to Bob. Alice and her electron > stay on earth but Bob takes his electron and gets in a near light speed > spaceship and after 4 years is on Alpha Centauri. And after 4 years Alice > picks a direction at random, calls that "up" and measures the spin of her > electron in that direction with a Stern Gerlach magnet.* > > *At that instant the universe splits into two, in one Alice has the spin > up electron and Bob has spin down, and in the other universe Alice has spin > down and Bob has spin up.* > How does that happen, exactly? At the time Alice makes her measurement, Bob is at a spacelike separation, and does not know either the angle of Alice's measurement, or her result. In the absence of any such relevant information, Everett says that when Bob makes his measurement he splits into a branch where he sees UP, and a branch in which he sees Down. There is no possible correlation with Alice's result. Actually, this is not directly related to the violation of the Bell inequalities. This 4-way split, two branches for Alice and two for Bob, happens in every case, so their results for spacelike separations are always independent, and no correlation can ever be observed. Bruce -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/everything-list/CAFxXSLQnXU-pOCHs7JndD3ZrSoZcEh5QLWPzpgyPi4HqHOoC8w%40mail.gmail.com.
