> On 9 Apr 2018, at 00:48, Lawrence Crowell <goldenfieldquaterni...@gmail.com> > wrote: > > On Sunday, April 8, 2018 at 11:25:39 AM UTC-5, Bruno Marchal wrote: > >> On 5 Apr 2018, at 22:20, agrays...@gmail.com <javascript:> wrote: >> >> Assuming that QM is a non-local theory, if two systems become entangled, say >> via a measurement, do they necessary have a non-local connection? That is, >> does entanglement necessarily imply non-locality? AG > > As Everett already understood, non-locality is itself phenomenological. But > the violation of Bell’s inequality makes any mono-universe theory highly > non-local. It is my main motivation to be skeptical in any mono-universe > theory. > > Some, even in this list, believes that in the many universe theory there are > still some trace of no-locality, but generally, they forget to use the key > fact, explains by Everett, that observation are independent of the choice of > the experimental set up. In particular, a singlet Bell’s type of state, > involves really a multi-multiverse, somehow. Better not to take the idea of > “universe” to much seriously, as in fine, those are local first person plural > relative states, and they emerges already from elementary arithmetic, in a > way enough precise to be compared with the facts. > > Bruno > > > This sounds confused. There is noncontextuality in QM that states there is > nothing in QM that determines how an apparatus is to be oriented.
OK. > This is in ways thinking if the Stern-Gerlach apparatus, where its > orientation is a choice of basis vector. QM is invariant under choice of > basis vectors. The context of the experiment is then due to the classical or > macroscopic structure of the observer or apparatus. It seems you are saying the same thing as me. But this does not entails any physical action at a distance, unless we postulate a physical collapse of the wave (as opposed to a local entanglement relative to the observer, which is local and which propagates only at the speed of light. Then when Alice (say) measures its particle, it only tells Alice in which partition of the multiverse she belongs, and where indeed Bob will find the corresponding results. EPR and Bell assumes a mono-universe to get the non locality. Bruno > > LC > > -- > 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 > <mailto:everything-list+unsubscr...@googlegroups.com>. > To post to this group, send email to everything-list@googlegroups.com > <mailto:everything-list@googlegroups.com>. > Visit this group at https://groups.google.com/group/everything-list > <https://groups.google.com/group/everything-list>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. -- 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 post to this group, send email to everything-list@googlegroups.com. Visit this group at https://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/d/optout.
