From: scerir (scerir@libero.it)
Date: Fri May 10 2002 - 15:29:56 MDT
John K Clark:
> Ok, I think I understand what you're driving at but it won't work, you will
> detect interference in the second interferometer unless you have detectors
> at D3 or D1, what happened at D1 or D2 doesn't matter in the experiment as
> set up. Not everything can be entangled, the polarization and momentum of
> two photons can be, but neither of these attributes by themselves can
> command a interference effect in the machine you describe.
To make more clear - that I think it is possible to transmit some
"non random" information from a "Bell system" to another "Bell
system" - I can also change that rudimentary machine, which is
also fuzzy, because the perfect correlation (I need this!) between
photon 1 and photon 2 (each inside his interferometer) depends on many
parameters (like the length of the interferometer, the wavelenght,
etc.).
This is the new rocking-horse, :-)
| |
| source of |
<---|<------ two entangled ------->| D
| ph.1 photons ph.2 |
| |
M S
ph.1 = photon 1
ph.2 = photon 2
M = a mask, i.e. with letters, let us say "EXTROPY"
S = a screen
D = a moving device (scanner) which can read the screen
Now, the entangled ph.1 (or a beam of entangled photons)
just passes through the mask "EXTROPY".
The entangled twin brother ph.2 (or a beam of entangled
twin brothers) reproduce on the screen S (which can be
on Andromeda) the word "EXTROPY". A moving device D
(in Andromeda too)is able to read the screen.
This way we can trasmit the word "EXTROPY" from the
Earth to Andromeda.
Now many problems arise:
1. Is "EXTROPY" a random message?
[No. Well, ok, sometimes ...]
2. Do they (in Andromeda) understand the message?
[That's their problem, they must learn ...]
3. Does this message travel faster than light?
[I don't know. And now it's too late here ...]
This machine works, of course, in reality. The trick is "simple".
The bi-photon or the two entangled photons (or beams of entangled
photons) are, as usual, generated in a spontaneous parametric down
conversion (SPDC). As QM predicts, the momentum (or the position)
of each photon is not determinate, before measurement (scattering).
However, if one of these photons is measured, with a certain value,
also the twin brother "collapses" in a well defined value.
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