November 21, 2012 -by Kate Taylor
Unbreakable quantum cryptography could become a mainstream reality, following the discovery that it's possible to use it over today's fiber networks.
Toshiba's Cambridge Research Laboratory, together with the Cambridge University Engineering Department, say they have succeeded in extracting the very weak signals used for quantum cryptography from ordinary telecom fibres transmitting data traffic.
"Now we have shown that the single photon and data signals can be sent using different wavelengths on the same fibre."
The team's put its ideas into practice, successfully implementing quantum cryptography on ordinary telecom fibres while simultaneously transmitting data at 1Gbps in both directions. They managed a secure key rate of over 500Kbps over 50 km of fibre - about 50000 times higher than the previous best value for this fibre length. http://www.tgdaily.com/networking-features/67623-quantum-cryptography-demonstrated-over-existing-fiber-lines