[IP] Scientists teleport two different objects
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From: Dewayne Hendricks <dewayne@xxxxxxxxxxxxx>
Date: October 5, 2006 1:51:59 AM EDT
To: Dewayne-Net Technology List <dewayne-net@xxxxxxxxxxxxx>
Subject: [Dewayne-Net] Scientists teleport two different objects
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Scientists teleport two different objects
POSTED: 4:36 p.m. EDT, October 4, 2006
<http://www.cnn.com/2006/TECH/science/10/04/teleportation.reut/
index.html>
LONDON, England (Reuters) -- Beaming people in Star Trek fashion is
still in the realms of science fiction but physicists in Denmark have
teleported information from light to matter bringing quantum
communication and computing closer to reality.
Until now scientists have teleported similar objects such as light or
single atoms over short distances from one spot to another in a split
second.
But Professor Eugene Polzik and his team at the Niels Bohr Institute
at Copenhagen University in Denmark have made a breakthrough by using
both light and matter.
"It is one step further because for the first time it involves
teleportation between light and matter, two different objects. One is
the carrier of information and the other one is the storage medium,"
Polzik explained in an interview on Wednesday.
The experiment involved for the first time a macroscopic atomic
object containing thousands of billions of atoms. They also
teleported the information a distance of half a meter but believe it
can be extended further.
"Teleportation between two single atoms had been done two years ago
by two teams but this was done at a distance of a fraction of a
millimeter," Polzik, of the Danish National Research Foundation
Center for Quantum Optics, explained.
"Our method allows teleportation to be taken over longer distances
because it involves light as the carrier of entanglement," he added.
Quantum entanglement involves entwining two or more particles without
physical contact.
Although teleportation is associated with the science-fiction series
Star Trek, no one is likely to be beamed anywhere soon.
But the achievement of Polzik's team, in collaboration with the
theorist Ignacio Cirac of the Max Planck Institute for Quantum Optics
in Garching, Germany, marks an advancement in the field of quantum
information and computers, which could transmit and process
information in a way that was impossible before.
"It is really about teleporting information from one site to another
site. Quantum information is different from classical information in
the sense that it cannot be measured. It has much higher information
capacity and it cannot be eavesdropped on. The transmission of
quantum information can be made unconditionally secure," said Polzik
whose research is reported in the journal Nature.
Quantum computing requires manipulation of information contained in
the quantum states, which include physical properties such as energy,
motion and magnetic field, of the atoms.
"Creating entanglement is a very important step but there are two
more steps at least to perform teleportation. We have succeeded in
making all three steps -- that is entanglement, quantum measurement
and quantum feedback," he added.
Weblog at: <http://weblog.warpspeed.com>
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