> On 20 Aug 2018, at 20:02, Brent Meeker <meeke...@verizon.net> wrote: > > > > On 8/20/2018 2:10 AM, Bruno Marchal wrote: >>> On 19 Aug 2018, at 21:39, Brent Meeker <meeke...@verizon.net> wrote: >>> >>> >>> >>> On 8/19/2018 3:37 AM, Bruno Marchal wrote: >>>>> So the "many superpositions" that you posit are entirely arbitrary, >>>>> pulled out of the air without any justification. >>>> If she measure u, Bob get d. But is she measure u’, Bob get d’ (with >>>> certainly, if they have decided to measure in the same base u’d’ before). >>>> To account for that, obviously maintaining locality, we must take into >>>> account the initial uncertainty, due to psi = (|u>|d> - |d>|u>)/sqrt(2) = >>>> (|u'>|d'> - |d'>|u'>)/sqrt(2). >>> But that is a classical uncertainty as to which detect angle Alice chooses >>> and you have muddled the picture by leaving the detector and it's angle out >>> of the equation, and writing only the particle spin part down. >> Adding Alice will change nothing, > > I said you must include the detector, which has certain angle, and an > interaction term. Then the uncertainty is only whether the detector says > "up" or "down" and there are only two "worlds" that split by decoherence.
Yes, that is why the choice of the angle and the detector portioned the superposition in some way, but as Alice mind cannot impose a preference on this to nature and the psi state, she lost the ability to access to some worlds. Thus the multi-multiverse. Which I think is just the multiverse seen by taking account the quantum state is a Gauge state, having always a phase, except for the big whole. It is first person plural view, and thus psi is more epistemic than Everett would have liked, perhaps, and things are undoubtably subtle there. My point is that believing Everett remains non local is premature, at the least, and is usually based on some naive conception of “classical world”. Bruno > > Brent > >> unless from her point of view if she “irreversibly” memorise her outcome; >> then the symmetry is locally broken, but I am not sure for the “universal >> wave” describing Alice + Bob + the particles. There is no mixture states >> there. >> >> Bruno >> >> >> >> >>> Brent >>> >>> -- >>> 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. > > -- > 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. -- 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.
