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Entanglement Experiment Points Toward Quantum Repeaters

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Reporting in the Aug. 19 issue of Nature, researchers at Universität Wien in Vienna, Austria, describe a setup that simulates one aspect of the action of a quantum repeater in a long-distance quantum key distribution system. In the work, the researchers teleported a polarization state from one entangled photon to another 600 m across the Danube River through an 800-m optical fiber. Entangled states naturally decohere over distance in a communications channel. Performing teleportation, purification and quantum memory functions, quantum repeaters would "entanglement swap" quantum states...Read full article

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    Published: September 2004
    Glossary
    optical fiber
    Optical fiber is a thin, flexible, transparent strand or filament made of glass or plastic used for transmitting light signals over long distances with minimal loss of signal quality. It serves as a medium for conveying information in the form of light pulses, typically in the realm of telecommunications, networking, and data transmission. The core of an optical fiber is the central region through which light travels. It is surrounded by a cladding layer that has a lower refractive index than...
    As We Go To PressBreaking NewsCommunicationsConsumerfiber opticsoptical fiberPresstime Bulletinquantum key distribution systemquantum repeatert WienUniversitä

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