On 7/18/2018 1:19 PM, smitra wrote:
On 18-07-2018 19:58, Brent Meeker wrote:
On 7/18/2018 6:45 AM, smitra wrote:
While one can then still argue that MWI does have non-local aspects
to it because the branches do not split in a local way, for me what
matters is that all such issues are explained by local dynamics,
while in collapse interpretations you have more problems precisely
due to the unexplained collapse. In collapse interpretations, new
information appears right at the moment of collapse and does so
non-locally in case of entangled spins. In the MWI, the branching is
only an effective picture, the exact picture does not contain any
branching. No new information appears in the global state. The
self-localization of observers within this global state has
non-local aspects to it, but there is an explanation for that that
invokes only local dynamics.
But what are these "local dynamics" and how do they conspire across a
spacelike interval to ensure that only Alice and Bob with notebooks
violating Bell's theorem meet one another?
Brent
Consider the fact that in principle, you could program a giant quantum
computer with a large number of qubits playing the role of
environmental degrees of freedom causing an effective decoherence of
local subsystems of qubits, but not of the entire quantum computer.
Within such a setting one can consider all of Bruce's thought
experiments using virtual Bob and virtual Alice, expand out everything
in the basis where the logbooks of both are diagonal. We start with
creating an entangled state of two qubits, and that eventually leads
to entangled logbooks plus their local environments.
But that doesn't seem to be local. To diagonalize both logbooks means
picking out spacelike correlations. Of course you can do it in a
computer simulating the process because the computer is not restricted
to local dynamics.
Brent
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