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BOFFINS IN JAPAN have succeeded in transmitting a single photon by 150 kilometres, beating their own record of 100 kilometres they announced last July.
Scientists at NEC, the Telecomms Advancement Organisation of Japan, and Japan's Science and Technology Agency, said that the breakthrough is likely to lead to highly secure optical fibre networks in the future.
The method uses a quantum cryptography system using optical planar circuits and a low noise photon receiver.
The system allows single one way photon transmission which reduces the noise of other photon from the optical fibre and suppresses deterioration of photon detection sensitivity which happens because of the widening of the photon pulse width on long fibre transmissions.
The scientists said that quantum cryptography beats current systems because their security is based on limited calculation abilities of current computers. But quantum cryptography, they claim, doesn't rely on calculation but on the principles of physics
Source:
The INQ!
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