[escepticos] teleportacion replicada...

[planetario@...>]

 DE Discovery Online...

Star Trek Teleporting Replicated
In an experiment straight out of "Star Trek," scientists have successfully
teleported a beam of light across a laboratory bench.
In case you're not a Trekkie, that means they transmitted information that
allowed a replica of the beam to be made without sending the beam itself. It
represents an important step on the road to faster, more powerful computers.
"What's been teleported is the 'quantum state' of the light beam," says H.
Jeff Kimble, physics professor at the California Institute of Technology,
and a co-author of a paper on the experiment in the latest journal Science.
Last year, scientists teleported a light particle, or photon, but this is
the first time a light beam has been sent.
In the subatomic quantum world, things exist in many possible states until a
measurement forces it to assume one specific value. So there's always some
"fuzziness" about the properties of things. Like foam on top of an ocean
wave, there is "quantum fuzz" on top of every wave of light. You can't
recreate the "fuzz" on top of a light beam without knowing its quantum
state.
If you try to measure the quantum state, though, you change it, so you can't
learn enough about it to replicate the original state. The trick is to pass
the quantum information along without explicitly measuring it.
To do that, Kimble's group first generated a pair of what physicists call
"entangled" light beams, two beams that are almost twins of one another.
They sent one to a detector called Alice, and the other to one called Bob.
The quantum fuzz of the entangled beams was so strong that it essentially
hid that of a third light beam -- the one to be transported from Alice to
Bob. Therefore, they never measured it and never disturbed its quantum
state; they just passed it on.
Quantum teleportation represents a new way to transfer information. "(This
is) the birth of a new science, quantum information science," Kimble says.
In the future, quantum computers will work much faster than today's computer
technology.
"It's likely the Caltech experiment will lead to rapid progress," says
Carlton Caves, from the University of New Mexico.
But will we ever teleport people, like in Star Trek's transporter? "I don't
know," Kimble admits. "But I think it's a remarkably interesting scientific
question."
By Sally Stephens, Discovery Online News


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