From: scerir (scerir@libero.it)
Date: Sat May 11 2002 - 09:36:15 MDT
> > Shih et al. performed a different experiment, this way.
> >
> >
> > |> >
> > | source of | >
> > <---|<------ two entangled ------->| > >
> > | ph.1 photons ph.2 | >
> > |> >
> > D S
> I don't get it. Is there a good reason why this is not an interstellar
> ansible in fee simple? Put the source at the midpoint of Centauri and
> Earth, put D on Earth, put S on Centauri. Switch D on and off and S goes
> from patterned to unpatterned. Dot dot dash dot...
> Eliezer
It is not easy to find a big good source of (just) entangled photons!
There is always some noise in the SPDC. In these experiments
they have to use filters, polarizers, and detectors of coincidences
to be sure that they are recording just entangled photons events.
[btw, you can also "modulate" the "emission", if you shift the double
slit D, along the vertical axis, you also shift the interference
pattern on the screen S !]
s.
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