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Physicists Teleport Quantum Bits Over Long Distance

By John Roach for National Geographic News January 29, 2003
The technology, known as teleportation, involves taking away the material properties of an object at one location and transferring the exact details of its configuration to another location where it is reconstructed.

Quantum teleportation is the transferring of tiny units of computer information, called quantum bits or qubits, from one location to another. The technology is referred to as a type of teleportation because the information teleported behaves more like an object than normal information.
"It is quantum information, which cannot be copied and cannot appear at the new location without being destroyed at the old location," said William Wootters, a physicist at Williams College in Williamstown, Massachusetts who co-authored a 1993 paper that outlined the theory of quantum teleportation.
Scientists treat quantum information as if it were an object. The fact that the information cannot be conveyed without first being destroyed also differentiates quantum teleportation from faxing a document, which makes an imprecise replica of the original at another location and leaves the original intact.
 
"We report the first experimental long distance demonstration of this fascinating aspect of quantum mechanics," said Nicolas Gisin, a physicist at the University of Geneva.
His team teleported qubits carried by photons—particles of light—of 0.05 inch (1.3mm) wavelength in one laboratory onto photons of 0.06 inch (1.55mm) wavelength in another laboratory 180 feet (55 meters) away along 1.2 miles (2 kilometers) of fiber optic wire.


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