home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!mtnmath!paul
- From: paul@mtnmath.UUCP (Paul Budnik)
- Newsgroups: sci.physics
- Subject: Aspect's experiment, was Re: Peer review ...
- Message-ID: <452@mtnmath.UUCP>
- Date: 24 Dec 92 20:06:15 GMT
- References: <Bzr4LI.FL@well.sf.ca.us>
- Organization: Mountain Math Software, P. O. Box 2124, Saratoga. CA 95070
- Lines: 60
-
- In article <Bzr4LI.FL@well.sf.ca.us>, sarfatti@well.sf.ca.us (Jack Sarfatti) writes:
- >[...]
- > *Paul, I'm sure Alain Aspect would not agree with you! Aspect stayed with
- > me in San Francisco a few years ago.
-
- I do not what Aspect thinks but the two references that I am relying on
- are:
- J. D. Franson, Physical Review D, pgs. 2529-2532, Vol. 31, No. 10, May 1985.
- A. Leggett, Foundations of Physics, V 17, p. 875.
-
- Both make it clear that Aspect's experiment was not conclusive. I am not
- aware of any refutation of the arguments these two present. I have read
- Aspect's original papers and I think the arguments that Franson and Leggett
- make are correct.
-
- > [...]
- > In my analysis this delay is negligible (i.e. short compared to flight
- > times from source to polarizer) and essentially irrelevant. Why do you
- > think it important?
-
- Unless you measure it directly you have no proof that locality is violated.
- It is also central to my argument that QM is incomplete. You can measure the
- statistics of these delays, but QM does not predict what those statistics are.
-
- > [...] What
- > possible relevance can 24 or 35 have to the basic idea of Aspect's
- > experiment? So far, Budnik I fail to see where the problem is. Perhaps,
- > someone else sees the problem? Does anyone else see what Budnik sees? Well
- > let's continue.*
-
- You cannot know what any of the times are that you discuss. A photon cannot
- be regarded as a classical particle traveling at the speed of light. You
- can only know what the delays are in QM if you observe them directly.
-
- >[...]
- > You cannot know where a particle is at a given time unless you observe the
- > particle at that time.
- >
- > *I agree with the above abstract remark but fail to see how it is relevant
- > to the concrete question at issue. Does any one else recognize how it is
- > relevant?*
-
- It means you cannot base an analysis of delays on distances and the speed
- of the particle.
-
- > [...]
- > The way you measure the delay is by varying the polarizers between states
- > that maximize and minimize the probability of joint detections.
- >
- > *The probability of joint detection is (cos@)^2/2 so that @ = 0 is max and
- > @ = pi/2 is min. That much I understand. But I do not understand in
- > operational terms "measure the delay is by varying the polarizers between
- > states".
-
- You switch from a state of minimal joint detections to maximal joint
- detections. You then see how long it takes before this switch starts
- increasing the number of joint detections. It is a moderately complex
- statistics problem to analyze this but presents no fundamental difficulties.
-
- Paul Budnik
-