On 5/10/2013 10:04 AM, Bruno Marchal wrote:

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On 10 May 2013, at 18:09, meekerdb wrote:On 5/10/2013 1:00 AM, Bruno Marchal wrote:On 09 May 2013, at 18:08, meekerdb wrote:On 5/9/2013 1:44 AM, Bruno Marchal wrote:I don't think that requires a wave function collapse, it's explained by Everett'sMWI also, which is a kind of non-local hidden variable.Why non local? There is nothing non local in Everett's MWI.Sure it is. When you take the trace of the density matrix over the environment toget a set of orthogonal subspaces that's a non-local, mathematical operation.Local is about physical reality, not mathematical operation. The wave describing thephysical (physicists included) evolves deterministically and locally. Non locality isin the (mathematical) appearances.In an EPR type experiment the wave-function's evolution is not local. It changes overa space-like interval.Only from the (first person plural) participators points of view, abstracting from theleaked information in the environment(s), a local, computable, phenomenon, at thecorrect dimensions.

`?? The state exists in Hilbert space, not space-time. I depends on space-time variables`

`which are space-like separate. So even in a MWI picture the state is not local and the`

`change in state due to a measurement interaction doesn't propagate in space-time.`

Eventually to make this precise you need to marry GR and the quantum, and that's not easy.

So will comp contribute to this? Brent Perhaps you are dreaming about building a non abelian anyonic quantum computing machine through some fractional quantum Hall effect? This is less elementary. --- Bruno Marchal -- 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 http://groups.google.com/group/everything-list?hl=en. For more options, visit https://groups.google.com/groups/opt_out.