Quantum Cryptography Conquers Noise Problem

"transmitted a quantum key along a 90-kilometer fiber, which also carried noisy data at 1 billion bits per second in both directions ? a rate typical of a telecommunications fiber."

Telecommunications fiber with a 90km (~50mi.) length would be considered backbone. Typically two fibers are used to send signal in both directions. Single fiber applications require different frequencies of light to both TX & RX. This single fiber application is only used in metro FTTX/GPON situations - never in back

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/akhW918R2MQ/story01.htm

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