Quantum cryptography has the potential to guarantee perfectly secure communications, but until now all of the prototype systems have been point-to-point links rather than networks that share connections. . . .
Quantum cryptography has the potential to guarantee perfectly secure communications, but until now all of the prototype systems have been point-to-point links rather than networks that share connections.

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. "Any node in the network can act as a relay," said Chip Elliott, a principal scientist at BBN Technologies. The researchers will soon move one of the network nodes across town to link Boston University into the network, said Elliott.

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