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Atom Experiment Brings Teleportation Closer to Reality

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Atom Experiment Brings Teleportation Closer to Reality




LONDON (Sept. 26) - Physicists in Denmark have made two samples of trillions of atoms interact at a distance in an experiment which may bring Star Trek-style teleportation and rapid quantum computing closer to reality.


Eugene Polzik and his colleagues at the University of Aarhus are not about to beam anyone up to the Starship Enterprise, but their research reported in the science journal Nature on Wednesday makes the idea of instantly transporting an object from one place to another less far fetched.


It involves quantum entanglement -- a mysterious concept of entwining two or more particles without physical contact. Albert Einstein once described it as ''spooky action at a distance.''


Entangled states are needed for quantum computing and teleportation. Scientists have entangled states of a few atoms in earlier experiments but Polzik and his team have done it with very large numbers and using laser light.


''It is the first result where two macroscopic material objects have been entangled,'' Polzik explained in a telephone interview.


''We have produced entanglement at a distance which means you and me can share entangled objects which is important for quantum communication, including quantum teleportation.''


In 1998 what has been described as the first teleportation experiment was done when scientists at the California Institute of Technology teleported a beam of light across a laboratory bench.


Ignacio Cirac, a physicist at the University of Innsbruck in Austria said achievement of Polzik and his team could lead to real-life quantum communication systems, teleportation and quantum computers.


''This is the first time two different atomic samples have been entangled in this way -- using light -- even though the samples are separated by some distance,'' he said in a commentary in Nature.


Cirac believes further experiments will follow which could ''revolutionize the field of quantum information.''


Reuters 14:56 09-26-01



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RE: This is incredible news!


LAST EDITED ON 02-Oct-01 AT 03:54PM (EDT)




This is excellent news indeed!


(I have been passing this one around as well)




Quantum entanglement: Going large


Particles small enough for their behaviour to be governed by the laws of quantum mechanics can exhibit a remarkable property known as entanglement. A pair of quantum particles can exist in entangled 'superposition', a mixture of states that resolves only when some physical property such as spin or polarization is measured. Quantum entanglement is a fundamental requirement for quantum computing, but until now it has been possible only to generate entanglement between microscopic particles. Using a new method of generating entanglement, an entangled state involving two macroscopic objects, each consisting of a caesium gas sample containing about 1012 atoms, has now been created. The entangled spin state can survive for 0.5 milliseconds, a long time in this context, bringing practical applications of quantum memory and quantum teleportation a little closer.


Experimental long-lived entanglement of two macroscopic objects




Nature 413, 400-403 (27 September 2001)


Quantum physics: Entangled atomic samples




Quantum mechanics has potential applications in communication and computation. But first a quantum connection — known as entanglement — has to be created between bigger and bigger objects.


Nature 413, 375-377 (27 September 2001)


Trillion-atom triumph


27 September 2001 table of contents






Nature © Macmillan Publishers Ltd 2001 Registered No. 785998 England.


"Everything you know,...is Wrong!


soon we shall all discover the truth."





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RE: This is incredible news!


But do you really want to be destroyed and have an exact duplicate made of you elsewhere? It raises difficult questions about consciousness and the continuity of experience.



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