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China Develops Quantum Cryptography Network

By Chinese Academy of Sciences

May 13, 2009

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Researchers at the University of Science and Technology of China say they have developed the first optical quantum cryptography network. The quantum communication system enables three users to speak in real time with telephones, or one user to broadcast to the other two users by using one-time pad encryption. The network makes use of a chained topography to forward secret keys in a hop-by-hop manner along QKD links. As a result, there are no conditions for using one-time pad authentication and encryption for information transmission. The middle node serves as trusted relays and increases the key generation rate to a higher degree. Researcher Pan Jianwei adds that his team has extended the key generation distance to 200 kilometers.

From Chinese Academy of Sciences
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