On 5/06/2016 3:31 am, Bruno Marchal wrote:
On 04 Jun 2016, at 01:28, Bruce Kellett wrote:
On 4/06/2016 4:16 am, Brent Meeker wrote:
If the world is a simulation, i.e. is being computed by a Turing
machine, then the computation can implement non-local hidden
variables and violate Bell's inequality in the simulated world (in
fact all its variables would be non-local since locality and
spacetime would just be computed phenomena).
Sure, Bell's theorem only rules out local hidden variables. If you
simulate non-local hidden variables (i.e., get the separated
experimenters to communicate non-locally), then of course you can
reproduce the quantum correlations. But I was under the impression
that the computationalist goal was to eliminate non-locality.
Separated experimenters, with as much computing power as necessary,
cannot simulate the quantum correlations by performing only local
computations.
You can simulate the whole (multiversial) structure, and the observers
will find that from their perspective, Bell's inequality are violated.
From outside, we can see (like Everett saw) that it is just a case of
self-duplication FPI. (Which brings us back to the preceding thread of
course).
Locally, Alice and Bob can simulate anything they like, and they can
simulate universes with non-local hidden variables, and predict that
within those worlds the Bell inequalities are violated. But when they
get back to their own world and compare their results, they will find
that the correlations between their separate simulations of the results
of spin measurements at arbitrary angles invariably satisfy the
inequalities. In other words, they cannot, jointly, simulate the quantum
results in any world that they both inhabit. The MWI view from outside
is no different -- non-locality is inescapable.
Bruce
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