On 4/22/2018 9:19 AM, Bruno Marchal wrote:
It follows from both QM and Comp. If Alice and Bob are
space-separated, I cannot even makes sense of how you can measure
correlations, given that once they are separated, whatever result they
got, will be shared with different Alice and Bob in different branch.
I am not even sure we can define what could be an action at a distance
in the quantum formalism. The notion does not even makes sense when we
assume special relativity. The only reason to believe this is the
habit to think that there is only one bob and one Alice, which makes
no sense once separated, unless they are correlated with a third
observer, but then, again by looking at the wave without collapse,
there will be no action at a distance. The no locality is only an
appearance due to the fact that we belong to infinities of histories,
and cannot known which one we are in.
It depends on what you mean by "action at a distance". The theory you
are depending on for these pronouncements entails that, on a MW picture,
some of the possible worlds have probabilities that go to zero as a
result of an interaction at Alice or at Bob. So an interaction at one
of them changes the probabilities at the other.
Brent
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