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- Path: sparky!uunet!mtnmath!paul
- From: paul@mtnmath.UUCP (Paul Budnik)
- Newsgroups: sci.physics
- Subject: Re: hidden variables
- Message-ID: <486@mtnmath.UUCP>
- Date: 11 Jan 93 16:34:27 GMT
- References: <1993Jan10.141141.7849@oracorp.com> <483@mtnmath.UUCP> <1993Jan11.031733.1730@cs.wayne.edu>
- Organization: Mountain Math Software, P. O. Box 2124, Saratoga. CA 95070
- Lines: 26
-
- In article <1993Jan11.031733.1730@cs.wayne.edu>, atems@igor.physics.wayne.edu (Dale Atems) writes:
- > In article <483@mtnmath.UUCP> paul@mtnmath.UUCP (Paul Budnik) writes:
- > > [Eberhard's description of locality violation in QM deleted.]
- >
- > Consider the Stern-Gerlach-type experiment described in my other
- > post. Clearly that situation is not as simple as implied by Eberhard's
- > argument. It is not a case of getting one probability distribution
- > for spins measured at site 1 if the setting of magnet 2 is 40 degrees,
- > and another if it is 90 degrees. You have to use measurements from
- > *both* sites on members of a pair to observe the quantum correlations.
- >
- > Is there a case where the nonlocality is as obvious and trivial as
- > this quote seems to imply?
-
- Eberhard's point is the setting at one site affects the probability
- distribution at the other site. The exeriment you sited is slightly different
- then the photon experiment Eberhard was talking about. You detect all particles
- and sort them by spin direction. Thus you do not have a literal 'knob'.
- However it still must be true that the observation made at one site of
- each particle affected the observations made at the other site. It does
- not matter in which direction this influence flows but it must flow in
- at least one direction or you cannot get a violation of Bell's inequality.
- The polarizer/photon experiment exactly conforms to the situation
- Eberhard describes. It is the one he uses in his analysis.
-
- Paul Budnik
-