2006/01/01 by Eleni Diamanti, Hiroki Takesue, Carsten Langrock +3
Computer Science · Engineering · Physics and Astronomy · #Avalanche photodiode #Computer network #Computer science #Cryptography #Detector #Differential phase #Eavesdropping #Jitter #Key generation #Lithium niobate #Optics #Optoelectronics #Phase (matter) #Photon #Photonic and Optical Devices #Physics #Quantum #Quantum Information and Cryptography #Quantum channel #Quantum cryptography #Quantum information #Quantum key distribution #Quantum mechanics #Quantum optics and atomic interactions #Telecommunications #quant-ph
paper · pdf · doi:10.1364/oe.14.013073
published as Optics Express 14, 13073 (2006) · 10 pages, 5 figures
openalex publication_date 2006/01/01 · arxiv created 2006/08/13 · arxiv updated 2015/06/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present a quantum key distribution experiment in which keys that were secure against all individual eavesdropping attacks allowed by quantum mechanics were distributed over 100 km of optical fiber. We implemented the differential phase shift quantum key distribution protocol and used low timing jitter 1.55 microm single-photon detectors based on frequency up-conversion in periodically poled lithium niobate waveguides and silicon avalanche photodiodes. Based on the security analysis of the protocol against general individual attacks, we generated secure keys at a practical rate of 166 bit/s over 100 km of fiber. The use of the low jitter detectors also increased the sifted key generation rate to 2 Mbit/s over 10 km of fiber.