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Photon Detectors Have Record Efficiency

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GAITHERSBURG, Md., June 3 -- Sensors that detect and count single photons, the smallest quantities of light, with 88 percent efficiency have been demonstrated by physicists at the National Institute of Standards and Technology (NIST). They said this record efficiency is an important step toward making reliable single photon detectors for use in practical quantum cryptography systems, the most secure method known for ensuring the privacy of a communications channel. The four yellow squares in the center of this micrograph are NIST single-photon detectors. The top two detectors are 25 by 25...Read full article

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    Published: June 2005
    CommunicationsdefenseNational Institute of Standard and TechnologyNews & FeaturesNISTprivacyquantum cryptography systemsSensors & Detectorssingle photon detectors

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