🚀 go-pugleaf

I was reading "In Search of Schrodinger's Cat" recently and came across
a reference to an experiment conducted by a Terry Clark at U of Sussex
around 1983.  It involved a superconducting ring about 5mm diameter with
a very narrow constriction at one point, creating a standing wave
around the ring.
  Apparently this standing wave allowed the whole ring to be treated
(even to act) as a single quantum 'particle'.  A detector set up
on one side of the ring detected changes in quantum states caused by
a stimulus on the other side.  What caught my attention was the remark
that the change in quantum state was _not_ observed to start at the
stimulus and propagate at C around the ring, rather it occurred
simultaneously around the whole ring at once.
  Now, that sounds like FTL to me, but perhaps that was phase velocity?
Does anyone have more knowledge (NOT wild-assed speculation, please)
about this experiment or followups to it?  (The Clark team apparently
had planned a meter-long setup next - did it ever get built? What
results?)  Has the experiment been repeated?  Etc, etc...
-- 
 Alastair JW Mayer     BIX: al
                      UUCP: ...!utzoo!dciem!nrcaer!cognos!geovision!alastair

 "What we really need is a good 5-cent/gram launch vehicle."