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.
Saibal
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