Quantum networks descend from the study of Quantum cryptography. The idea of a quantum network emerged after successful experiments on quantum teleportation. When two companies (one from Switzerland, 'idQuantique', and another from the USA, 'MagiQTech') released practical communication devices based upon the rules of quantum mechanics, the need for a secure network capable of utilizing quantum principles was realized. These networks are now known as quantum communication networks. In these networks, data are communicated as quantum states through the technique of entanglement via an optical fiber link.
History of development
On October 23rd, 2003, DARPA Quantum Network, the first quantum encrypted functional network, becomes fully operational in BBN Labs.
In June 2004, Dark fibre routed beneath the streets of Cambridge, Massachusetts was used to link Harvard University with the BBN Technologies campus, allowing non-stop quantum cryptography 24/7.
In December 2004, the Quantum Network consisted of six nodes. Four nodes were 5 MHz and was built by BBN Labs. They were BB84 systems designed for telecommunications fiber and inter-connected by a photonic switch. Two nodes are electronics subsystems for a high speed free-space system designed and built by NIST.
In June 2005, DARPA Quantum Network expands to incorporate its first free-space link, allowing quantum keys and communications to be transmitted securely through the air.
- Elliott, Chip. "The DARPA Quantum Network". Optics and Optoelectronics Papers. Retrieved 18 February 2012.
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