On Sat, 12 Mar 2022 at 12:59, Bruce Kellett <bhkellet...@gmail.com> wrote:
> On Sat, Mar 12, 2022 at 12:12 PM Stathis Papaioannou <stath...@gmail.com> > wrote: > >> >> Are you saying that probability in itself is incompatible with MWI or >> only that the particular probabilities are incompatible with MWI? >> > > MWI is a deterministic theory so it does not have an intrinsic notion of > probability. Probabilities can be grafted onto MWI in one way or another, > but such probabilities do not give rise to the quantum correlation for > entangled particles unless something else is in play. I consider the other > ingredient required is non-locality. Many-worlds advocates seem to think > that some degree of magic is involved. > > Consider Alice and Bob sharing N entangled pairs of spin 1/2 particles. > Their measurements at spacelike separations are independent, so each > generates a binary string of 0s and 1s (if that coding is used for > up/down). In deterministic MWI, the N pairs generate all 2^N possible > sequences of results for Alice and Bob independently. When they meet, each > copy of Alice splits according to the 2^N copies of Bob, and vice versa. So > there are (2^N)^(2^N) separate branches. But of these, each Alice branch > must be matched with the appropriate Bob branch in order to get the correct > probabilities (correlations). If this matching does not take place until > Alice and Bob exchange results, it can only be described as magical. > Whereas, if Bob's results depend non-locally on Alice's results, then there > is only one copy of Bob to meet each copy of Alice (i.e., the matching is > already in the data) and no magic is needed when the Alice-Bob pairs meet. > If this experiment is simulated on a computer and the necessary correlations obtain with the simulated Alices and Bobs, would you call that a local or non-local effect? -- Stathis Papaioannou -- 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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAH%3D2ypXcMjpmskYVEx5FfDSXs3fhMuPU3Z4OGpNRTPrtTMPA7w%40mail.gmail.com.
