On 22-11-2024 09:30, Bruce Kellett wrote:
On Fri, Nov 22, 2024 at 7:05 PM smitra <[email protected]> wrote:
On 22-11-2024 06:40, Brent Meeker wrote:
That's what is ruled out by violation of Bell's inequality.
Bells' theorem doesn't apply to QM,
I think it is about time that you read Bell's papers. His theorem is
not about hidden variable theories, or non-local theories. He assumes,
for the purposes of argument, a local theory.
He assumes a deterministic local hidden variable theory.
He then derives a series
of inequalities that such a local theory must satisfy. Experimentally,
these inequalities are violated. Inspection of standard QM gives
results that agree with experiment, but these results also require
non-locality.
No, non-locality is not required.
The conclusion drawn from these experiments is that
quantum mechanics, itself, is non-local.
No, that's not the conclusion. If there were any truth in what you are
saying, then you wouldn't have Sidney Coleman saying things like this:
https://youtu.be/EtyNMlXN-sw?t=2023
And Prof. Marletto wouldn't have put point nr. 2 on her slide:
https://youtu.be/DT61eSiOs50?t=299
Saibal
Bruce
it's a theorem about deterministic
hidden variable theories that says that certain correlations like
some
of those of QM cannot be reproduced by any local hidden variable
theory.
The relevance of Bell's theorem to QM is only that it rules out that
if
QM is not fundamental and has an underlying hidden variable theory,
then
that hidden variable theory cannot be local.
So, if we then assume that QM is fundamental, then there is no
objection
against QM being local. Getting to non-local states via local
dynamics
isn't a problem as this is routinely done in experiments where
entangled
spin pairs are created. Nothing non-local goes on as far as the
dynamics
is concerned in such experiments.
Saibal
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