On 10 May 2013, at 19:18, meekerdb wrote:
On 5/10/2013 10:04 AM, Bruno Marchal wrote:
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's MWI 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 to get a set of orthogonal subspaces that's a
non-local, mathematical operation.
Local is about physical reality, not mathematical operation. The
wave describing the physical (physicists included) evolves
deterministically and locally. Non locality is in the
(mathematical) appearances.
In an EPR type experiment the wave-function's evolution is not
local. It changes over a space-like interval.
Only from the (first person plural) participators points of view,
abstracting from the leaked information in the environment(s), a
local, computable, phenomenon, at the correct 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.
There is no change in state due to a measurement, just local contagion
of superposition, and an observation which just inform us in which
partition of the multiverse we are. Of course a quantum sate is not
local, like a computation is not localized in the UD "in one place",
but in infinity of place. But there is no physical action at a
distance at all.
Eventually to make this precise you need to marry GR and the
quantum, and that's not easy.
So will comp contribute to this?
Comp, if correct, has no choice in the matter, given that it reduces
the whole of physics to intensional variants of machines' self-
reference.
Bruno
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
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