From: Hal Finney (hal@finney.org)
Date: Sat May 11 2002 - 11:02:28 MDT
Scerir writes:
> Shih et al. performed a different experiment, this way.
>
>
> |> >
> | source of | >
> <---|<------ two entangled ------->| > >
> | ph.1 photons ph.2 | >
> |> >
> D S
>
> ph.1 = photon 1
> ph.2 = photon 2
> D = a double slit
> S = a screen
>
> Photon(s) 1 just passes through a double slit D, that's all.
> Photon(s) 2 reaches the screen S where *it* (which did not
> cross a double-slit!) draw a weird interference pattern.
> If you remove the D from the first beam, the interference
> pattern on S vanishes.
No offense, but I don't believe that this can work as described.
As Eliezer points out, this would be a FTL communications device.
If someone had published a paper claiming have observed such an effect,
it would be revolutionary.
Furthermore, there is no reason in physics to think that it would work
this way. Instead, based on the properties of entangled photons, we
would predict that the "weird interference pattern" on the screen does
not change in a measurable way as the double slit is added or removed
from the remote photon stream. It might be that if we incorporate
information about which photons had the double slit and which did not,
that we could see some weird interference, but that information will be
necessary in order to notice the effect.
Do you have a reference for this experiment?
Hal
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