Re: I don't understand EPR
From: Bruce Bowen (brucebo_at_my-deja.com)
Date: 07/19/04
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Date: 19 Jul 2004 04:08:56 -0400
grelbr@hotmail.com (grelbr) wrote in message news:<1a325379.0406300628.6d138b4@posting.google.com>...
>
> As the subject says, I don't understand the EPR paradox.
> And so, I'm pretty much stumbling when it comes to Bell's
> theorm and the Aspect experiment and so on.
> The explanation goes, if the polarizer on one side detects
> a photon as vertical, then a vertical polarizer on the other
> side *must* detect the other photon as vertical.
>
> Ok, it's that "must" that stumps me. Why "must?" As near
> as I can tell, you've got a circularly polarized photon,
> it has an amplitude to be detected as vertical by a
> polarizer. The photon that goes through the polarizer
> is not in the same state as it was before. Now it is
> linearly polarized, oriented vertical.
"Why 'must?'"
The "must" you refer to is an empirical reality! In the same way
that "The speed of light in a vacuum is constant in all inertial
reference frames." Our job is to come up with a theory that (at least
mathematically if nothing else) models it correctly. There is no
logical way to model this reality other than to assume they are not
independent, but this assumption (non-local dependencies) violates (at
least the spirit of) GTR. This is the whole reason why it is
"spooky", and not understood at a visceral level.
-Bruce
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