DARPA Quantum Network Testbed

Abstract : BBN has designed and built the world's first Quantum Network testbed, delivering end-to-end network security via high-speed Quantum Key Distribution (QKD), and testing that Network against sophisticated eavesdropping attacks. BBN has fielded this ultrahigh-security network into commercial fiber across the metro Boston area. BBN's QKD network comprises 10 nodes. It is both extremely secure and 100% compatible with today's Internet technology. Four of the 10 nodes are running 24x7 over Boston metro telecom fiber between BBN, BU and Harvard and protecting Internet traffic; four other nodes are free-space; and two are based on polarization entanglement through fiber. BBN also teamed with NIST & University of Rochester to build the first superconducting single-photon detector. It saw first light in 2005. We characterized our prototype detector at temperatures ranging from 2K to 4K and expect to operate a full detector suite in early 2006 at speed up to 100MHz (20x faster than any existing detector). BBN also collaborated with MIT to build the world's first experimental demonstration of Eve, a quantum eavesdropper. The results were published in Summer 2006.

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