home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!mtnmath!paul
- From: paul@mtnmath.UUCP (Paul Budnik)
- Newsgroups: sci.physics
- Subject: Re: Quantum Mechanics Incomplete
- Message-ID: <477@mtnmath.UUCP>
- Date: 9 Jan 93 15:48:12 GMT
- References: <1ikj50INNgc6@gaia.ucs.orst.edu>
- Organization: Mountain Math Software, P. O. Box 2124, Saratoga. CA 95070
- Lines: 42
-
- In article <1ikj50INNgc6@gaia.ucs.orst.edu>, preddy@comphy.physics.orst.edu writes:
- > > [...]
- >
- > >> Not in cases where you have to use the assumption that
- > >> the wave function changes instantaneously when an
- > >> observation is made. There is nothing remotely
- > >> resembling this in classical theory.
- > [...]
- > As Feynman says, in "QED: The Strange Theory of Light and
- > Matter":
- >
- > "...It is to be emphasized that no matter how many arrows we
- > draw, add, or multiply, our objective is to calculate a _single
- > final arrow for the event_. Mistakes are often made by physics
- > students at first because they do not keep this important point
- > in mind. They work for so long analyzing events involving a
- > single photon that they begin to think that the arrow is
- > somehow associated with the photon. But these are probability
- > amplitudes, that give, when squared, the _probability_ of a
- > complete event. (Keeping this principle in mind should help
- > the student avoid being confused by things such as the
- > 'reduction of the wave packet' and similar magic)."
-
- If you think this is a valid argument against my claim that you have
- to use wave packet reduction in analyzing tests of Bell's inequality
- you are mistaken. It is not possible to get the standard predictions
- of quantum mechanics about the expected correlations without using
- wave packet reduction as an *intermediate* step. If you think there
- is a way around this I urge you to attempt it. I can assure you
- that if you succeed you will have an important original result. You
- will not succeed because you need some nonlocal physical law and the
- reduction of the wave packet is the only one around.
-
- What Feynman says is true of most experiments. I made this point in
- the introduction to my proof. It is not true of experiments designed
- to test Bell's inequality or any other experiment that predicts
- *macroscopic* nonlocal effects. Feynman was brilliant
- but not infallible. In analyzing these experiments you have to do
- a wave packet reduction *before* you get the final result or
- `complete event'.
-
- Paul Budnik
-