On 04-04-2022 01:38, Bruce Kellett wrote:
On Mon, Apr 4, 2022 at 12:52 AM smitra <smi...@zonnet.nl> wrote:
MWI is deterministic, but it's not a hidden variable theory. Bell's
theorem is proved by assuming you have local hidden variables that
specify the outcomes of experiments and then deriving inequalities
that
certain correlations should satisfy.
The central assumption that Bell makes is that of locality, or
separability. He shows that any local (separable) theory must give
correlations that satisfy the inequalities. Whereas QM, and
experiment, show that these inequalities are violated.
Determinism is also assumed. QM is not deterministic. And locality is
not the same as separability.
QM violates the Bell inequalities,
which means that there cannot be an underlying local hidden variable
model for QM. But QM itself can be local,
That is not a valid conclusion. Any local account of the correlations
can always be cast as a hidden variable theory -- if for no other
reason than if there is a local mechanism at play, this mechanism is
not evident in the standard theory (therefore hidden). Everettian many
worlds, if they could actually play this role, would be counted as
hidden variables for Bell's analysis. Bell does not specify what form
these hidden variables should take.
If all outcomes are realized then there cannot exist hidden variables.
The outcome of experiments is fundamentally stochastic in the MWI.
Bells's theorem does not
address theories that are not local hidden variable theories.
QM itself provides a local explanations for all experimental
outcomes,
including for the Bell correlations.
Then give it!
I'll write up the local account for a Bell-type experiment performed in
a quantum computer.
Bruce
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