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Atomic Gas Is a Nearly Perfect Photon Counter

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Although proposed linear quantum computation schemes show promise, they are premised on photon counters with efficiencies greater than 99 percent -- beyond the reach of today's best devices. Ataç Imamoglu of the University of California, Santa Barbara, however, suggests that methods of "storing" light in an ultracold atomic gas may offer a solution. Reporting in the Oct. 14 issue of Physical Review Letters, Imamoglu theorizes that photon-counting efficiencies better than 99 percent should be attainable by mapping the quantum state of photons from a probe laser onto an optically thick,...Read full article

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    Published: December 2002
    Basic ScienceResearch & Technology

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