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Any experimental verification of superluminal communication? That would have earned a couple of Nobel Prizes by now.

Instead, quantum optics has provided esperimental verification of Bell's inequalities, Hardy's theorem, the Kocken-Specker theorem, interaction-free measurement [which is not interaction-free], quantum teleportation [which is not teleportation but subluminal communication]...

There are enough wonders in empirically established quantum mechanics already.

We have met the enemy, and he is us — Pogo

by Migeru (migeru at eurotrib dot com) on Wed Jan 2nd, 2008 at 12:45:33 PM EST
[ Parent ]
This is pretty far off topic.  

However:  I do not know enough physics to know if it is possible; only enough to know how I would try to do it.  The basic idea would be to use the difference between the interference patterns that can be generated when particles do not choose, versus the lack of interference pattern that occurs when they are forced to choose.  Obviously the particles would be in batches--sequences--long enough to reliably create such patterns.  

Of technical problems, there should be many.  

Theoretically, it would be very interesting.  

The earth is only 21 light-milliseconds across.  I don't think it will improve cellphones much.  

The Fates are kind.

by Gaianne on Wed Jan 2nd, 2008 at 01:15:13 PM EST
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Well, you yourself said elsewhere in this thread that since the 70's, theory had outstripped experiment.

"Life shrinks or expands in proportion to one's courage." - Ana´s Nin
by Crazy Horse on Wed Jan 2nd, 2008 at 01:48:42 PM EST
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That is not a good thing. Theory has gone on without new experimental input. And I'm talking only about the standard model of particle physics. On quantum consciousness there is no real experimental lead because our understanding of consciousness is very poor on all levels.

We have met the enemy, and he is us — Pogo
by Migeru (migeru at eurotrib dot com) on Wed Jan 2nd, 2008 at 01:54:20 PM EST
[ Parent ]
Any experimental verification of superluminal communication?

Kind of.

And also here.

I can understand the group velocity argument, but what bothers me is that the rationale for 'proving' that superluminal communication can't happen seems very similar to the one that was being used to 'prove' with absolute relativistic certainty that the group velocity has to be less than c.

This doesn't 'prove' anything about what's possible, but it does make me suspicious of the rigour of the arguments that are being used.

by ThatBritGuy (thatbritguy (at) googlemail.com) on Wed Jan 2nd, 2008 at 04:59:35 PM EST
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Oh, that!Faster than a Speeding Light Wave - UFO Evidence
Researchers have now measured many group velocities higher than c. "It's just not true what they say in the textbooks," says Raymond Chiao of the University of California at Berkeley. For example, a Gaussian shaped light pulse can travel faster than c through some highly absorbing materials. The explanation is that the central piece of the pulse is attenuated more than the earliest piece. Although the pulse shape is unchanged, it comes out smaller, and the "leading edge" of the input pulse is transformed to become the peak of the emerging pulse, a process called "reshaping." So no part of the pulse is actually transmitted faster than c, says Chiao.
That doesn't constitute a test of superluminal transmission of information, though I can imagine an experiment being designed on the basis of this phenomenon.

We have met the enemy, and he is us — Pogo
by Migeru (migeru at eurotrib dot com) on Wed Jan 2nd, 2008 at 05:24:41 PM EST
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