Re: Afshar's experiment
From: scerir (scerir_at_libero.it)
Date: 07/30/04
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Date: 30 Jul 2004 08:42:26 -0400
"Oz"
> >I'm not sure what you mean. If you intend to have the light from the
> >two lasers going through different pinholes (I.e. laser 1 light only
> >goes through pinhole 1, laser 2 only though pinhole 2)
> >and then reduce it down to one photon at a time, I would expect to see
> >the equivalent result as when you just close one of the pinholes.
> I've lost the reference, but it was posted here about a year ago.
> No, you do indeed get interference.
In terms of photons the condition for interference
is that the two paths lead to the same cell of phase space,
so that the path of each photon is intrinsically indeterminate
('welcher weg'). Of course, if you close one slit and then
the other (and the first re-opens) the shutter (random or not
random) must be switched in a time which is less than the
uncertainty in the time arrival of the photon.
-L. Janossy, and K. Nagy, [Annalen der Physik, 17, (1956),
115-121].
-Leonard Mandel [J. Opt. Soc. Amer., 49, (1959), 931]
-R.M. Sillitto and Catherine Wykes [Physics Letters, 39-A-4,
(1972), 333] who performed the Janossy and Nagy experiment and found
a marvelous interference when just one photon was present in their
interferometer, at a time, and when their electro-optic
(not random) shutter was switched several times during the
time-travel of each photon.
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