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From: mikes@AMES-NAS.ARPA
Newsgroups: net.physics
Subject: none
Message-ID: <317@sri-arpa.ARPA>
Date: Tue, 25-Jun-85 21:22:57 EDT
Article-I.D.: sri-arpa.317
Posted: Tue Jun 25 21:22:57 1985
Date-Received: Tue, 2-Jul-85 06:12:50 EDT
Lines: 58

From:  mikes@AMES-NAS.ARPA (Peter Mikes)

et
  

        In reference to the topic raised by:

Sender: "John A. McNelly.OsbuSouth"@Xerox.ARPA
Subject: Re: Things that move faster than the speed of light
To: physics@sri-unix.ARPA
In-Reply-To: physics-request%SRI-UNIX:ARPA's message of 22 Jun 85
Message-Id: <850625-101837-1146@Xerox>


	>I just read "In Search Of Schrodinger's Cat," a book by John Gribbin,
	>intended to introduce laymen to the subject of quantum mechanics.  Does
	>anybody have any comments on the following excerpt, with respect to
	>info. travelling faster than the speed of light?  The first (long)
	>paragraph gives technical details on how the experiment works, the
	>second (short) paragraph gives the results of the experiment: that
	>information was transmitted instantaneously, faster than the speed
	>of light.

[pp. 231-232]
	>>"The Sussex team, headed by Terry Clark, has tacked the problem of
	>>making measurements of quantum reality the other way around.  Instead of

       The device being described looks like SQID = Superconductive Quantum
 Interference Device - however the topic you have introduced - namely the 
 superluminal communication by means of quantum transition across macrosco-
 pic distances is more general - quite controversial, related to EPR and
 probably closely related to the 'future of QM'.
   
       I will give two references - both fairly accessible but more exact
 and technical than a popular book:
 
	1) A.J.Legget: Schrodinger's cat and her Laboratory cousins.
 Contemporary Physics. Vol 25, No6, Nov/Dec 1984 pp583..598.
   
       ( The journal, by the way is a  very readable review journal ppubli-
 shed in Europe - more oriented to application thNEn Rev.Mod.Phys.)

	2)H.P.Stapp: Bell's theorem and the foundation of Quantum Mechanics.
 Am.J.Phys . April 1985.  ( I do not have the pages on the preprint).
 
     Important fact about both is (and a ton of other papers over last 50 years) is that SLC ( SuperLuminalCommunication ) was not demonstrated in the labo-
 ratory - even though many ingenious experiments were proposed  ( and at least
 on such tele-super-communicator is patented  )
 
         Some belive that it never will be demonstrated and the reason is that
 it is not clear what is collapsing when vawe function is measured ( a special
 case of the Quantum transition) :  A quote from paper 2) above :
 
    According to Heisenberg, the probability function .. :"represents mixture
 of two things, partly a fact and partly our knowledge of a faCT: ...'
 
   It is in this aspect - interpretation of 'psi' where the foundations come
 in and make the whole issue very interesting.: