2008/05/31 by Akihiro Tanaka, Mikio Fujiwara, Sae Woo Nam +11 · 1 citation
Computer Science · Engineering · Physics and Astronomy · #Optical Network Technologies #Quantum Information and Cryptography #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1364/oe.16.011354
7 pages, 3 figures, v2 : We added a comment on the significance of our work, some minor corrections, and references
arxiv created 2008/06/23 · openalex publication_date 2008/07/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We demonstrated ultra fast BB84 quantum key distribution (QKD) transmission at 625 MHz clock rate through a 97 km field-installed fiber using practical clock synchronization based on wavelength-division multiplexing (WDM). We succeeded in over-one-hour stable key generation at a high sifted key rate of 2.4 kbps and a low quantum bit error rate (QBER) of 2.9%. The asymptotic secure key rate was estimated to be 0.78- 0.82 kbps from the transmission data with the decoy method of average photon numbers 0, 0.15, and 0.4 photons/pulse.