From: *Lawrence Crowell* <[email protected]
<mailto:[email protected]>>
On Sunday, April 8, 2018 at 11:25:39 AM UTC-5, Bruno Marchal wrote:
On 5 Apr 2018, at 22:20, [email protected] 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. 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.
Yes, Bruno is terminally confused about non-locality. He refused to even
comment on my simple proof of non-locality in an Everettian context. As
usual, he is ruled by dogmatic beliefs rather than logical argument.
Bruce
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