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IEEE/LEOS Summer Topical Meetings

Differential phase shift quantum key distribution with up-conversion single-photon detectors

Eleni Diamanti, Carsten Langrock, Edo Waks A, M. M. Fejer, Y. Yamamoto, Hiroki Takesue, Toshimori Honjo, Kyo Inoue

Published Sep 22, 2006• 0 citations
Publisher

Abstract

A differential phase shift quantum key distribution experiment employing up-conversion single-photon detectors is presented. We achieved a 1-Mbit/s sifted key rate over a 20-km optical fiber, and distributed keys secure against general individual attacks over 75 km
DOI
10.1109/leosst.2006.1693991

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We report a quantum key distribution experiment based on the differential phase shift keying (DPSK) protocol with a Poissonian photon source, in which secure keys were generated over >100 km fibre for the first time. We analysed the security of the DPSK protocol and showed that it is robust against strong attacks by Eve, including a photon number splitting attack. To implement this protocol, we developed a new detector for the 1.5 μm band based on frequency up-conversion in a periodically poled lithium niobate waveguide followed by an Si avalanche photodiode. The use of detectors increased the sifted key generation rate up to >1 Mbit s −1 over 30 km fibre, which is two orders of magnitude larger than the previous record.