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Location: UFOUpDatesList.Com > 2007 > Jun > Jun 15

Re: E.S.A. Successfully Tests Real SETI Detector -

From: Martin Shough <parcellular.nul>
Date: Fri, 15 Jun 2007 22:35:54 +0100
Fwd Date: Fri, 15 Jun 2007 21:34:02 -0400
Subject: Re: E.S.A. Successfully Tests Real SETI Detector -

>From: Ray Dickenson <r.dickenson.nul>
>To: <ufoupdates.nul>
>Date: Thu, 14 Jun 2007 01:45:07 +0100
>Subject: E.S.A. Successfully Tests Real SETI Detector

>Hello List

>The European Space Agency (ESA) just successfully tested an
>`entanglement link' over 144 kilometers inside Earth's
>atmosphere. So it's fairly certain that such a link should work
>fine through interstellar space.


>What the ESA release doesn't stress is that such a link might
>give us instantaneous interstellar communications.

>More importantly, by attaching a de-modulator to a telescope
>you've also got a real SETI detector - looking for real, viable
>advanced communications, not the `radio smoke signals' that
>they're presently seeking.

>Maybe check details:


>that's maybe where ESA got the idea from.

The ESA story is about quantum cryptography, not FTL signalling.
The entanglement link does not itself carry any information. It
carries an encryption algorithm. Nonlocal entanglement is ideal
for encrypted communications for the very reason that the
entanglement itself contains zero information.

A photon polarisation state (say) measured by Bob at B is
correlated with another elicited or "forced" by Alice at A, so A
knows that Bob's state is instantaneously different, but this is
not useful information for Bob. Bob makes a "measurement" on a
photon and reduces the polarisation quantum state vector to +1
or -1 unpredictably, according to the usual probabilistic rules.
As Bob cannot know what the polarisation "would have been"
without Alice's intervention there is no way for him even to
know directly that there has even been any intervention, and
therefore there is no signal for him to receive. The difference
between two random outcomes is not information. The information
exists only in the total experimental set-up, which includes
both Alice and Bob, a decryption key, and a message, which is
not part of the entanglement but is sent separately by Alice to
Bob by radio, pigeon post, whatever, i.e. at < light speed.

This means that Ray's cosmic Alice and Bob, on opposite sides of
a star and intercepting entangled photon pairs emitted by it,
can perform whatever operations they like on these photons, and
correlations will be instantaneous, but the polarisation states
detected by either of them will contain no useful information.
The information is latent in the _pairs_ of states, and can only
be extracted retrospectively by comparison done at the speed of
light. Hence the "no signalling" theorem governing entanglement.

That's not to say that some future theory may not reinterpret
the meaning of nonlocality in a new way and find an unexpected
way around this. But in terms of present day quantum theory -
 and present day quantum theory is what the ESA experiment is
all about - instantaneous signalling is not possible via
entanglement. The Alain Aspect presentation linked from Ray's
webpage explains in more detail why this is so.

Martin Shough

Listen to 'Strange Days... Indeed' - The PodCast



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