From: <[email protected] <mailto:[email protected]>>
On Monday, April 23, 2018 at 1:50:31 AM UTC, Bruce wrote:
For Bruno, it seems that "non-locality" means "action at a
distance", where he interprets that to mean that there is some
superluminal transfer of information, by tachyons or some such.
And he is quite right to say that there is no such interaction or
dynamics in quantum theory. Because if "non-locality" meant some
superluminal transfer of information, by particles or something
else, then that would be giving a *local* explanation of
non-locality, which is a contradiction. So non-locality can never
mean "action at a distance", it can only mean that the theory is
such that the state is not separable, and changing one end
automatically changes the other, just as pushing one side of a
billiard ball moves the other side as well. (Ignoring the problems
of a relativistic explanation of extended physical objects. This
is not a particularly good analogy, but it is the best I can think
of at short notice!) In quantum mechanics, there can be no
"mechanical" explanation of the non-locality inherent in the
non-separable state. That is why we call it "non-locality" rather
than "action at a distance".
I acknowledge that there are linguistic problems here, but that is
just the nature of quantum mechanics, and we have to live with it.
Trying to "explain" this fact further is bound to fail, because
there is no deeper explanation.
Bruce
Let's agree that electrons A and B form a singlet entangled system.
Let's further agree that they are non separable. What do you do with
the fact that when their spins are measured, they ARE in different
spatial locations, not even space separated in Bell experiments. How
do we deal with this FACT? AG
What do you want me to do with the fact? I learn to live with facts that
I can't do anything about. The fact that the system is non-local is a
fact that you just have to come to terms with.
Bruce
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