On Tue, Mar 8, 2022 at 10:33 PM John Clark <johnkcl...@gmail.com> wrote:
> On Mon, Mar 7, 2022 at 5:02 PM Bruce Kellett <bhkellet...@gmail.com> > wrote: > > On Mon, Mar 7, 2022 at 7:41 PM smitra <smi...@zonnet.nl> wrote: >> > >> >>> >>> *>> For example, in the MWI picture from Bob's point of view, when he >>> measures his spin, he knows that the spin state of Alice in his sector is >>> the opposite.* >> >> >> >That is the question. How does he know this? >> > > In Many Worlds he knows this because when Bob makes a measurement the > universe (which includes Alice) splits into 2, in one universe Bob's photon > is polarized up and Alice's photon is polarized down, and in the other > universe Bob's photon is polarized down and Alice's photon is polarized up. > And that is entirely consistent with Alice's view of the situation. When > Alice makes a measurement the universe (which includes Bob) splits into 2, > in one universe Alice's photon is polarized up and Bob's photon is > polarized down, and in the other universe Alice's photon is polarized down > and Bob's photon is polarized up. In Many Worlds there are no universes > that have up-up or down-down photons because that would violate > Schrodinger's Equation which demands that angular momentum be conserved, > and the one and only assumption Many Worlds makes is that Schrodinger's > equation means what it says. > > >> > He is at a spacelike separation and cannot, locally, know either >> Alice's polarizer setting, or her result.. >> > > That is nonsense, the experiment has been performed many many times and > Bob ALWAYS makes the correct prediction about the polarization of Alice's > photon. > > > He cannot know that his spin state is opposite, because he cannot know >> 'opposite to what?' >> > > Huh? Opposite to the polarization measurement that Bob just made, > obviously. > It's a shame that we have spent so much time arguing about this when it is clear that you do not have the remotest understanding of what the issues actually are. The opposite polarization states you mention above are a direct consequence of the non-locality of the non-separable entangled spin state. Until you can grasp this fact, then we are going nowhere. 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 everything-list+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/CAFxXSLR2OPNK%3DFagUrYDFTDx6qJjsxONvU2sugPtonJhVSEQTw%40mail.gmail.com.
