Technology Review is carrying a report on the debut of a DARPA funded quantum cryptography network.
BBN Technologies, Harvard University, and Boston University researchers have built a six-node quantum cryptography network that operates continuously to provide a way to exchange secure keys between BBN and Harvard, which is about 10 kilometers away. The researchers will soon move one of the network nodes across town to link Boston University into the network.
Quantum cryptography schemes allow a pair of correspondents to securely exchange a one-time pad, or key that will unlock a scrambled message. The schemes call for transferring each bit of information using a single photon. The systems are potentially very secure because the quantum state of a particle cannot be observed without altering it.
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