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.
@article{arxiv.0805.2193,
title = {Ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength-division multiplexing clock synchronization},
author = {Akihiro Tanaka and Mikio Fujiwara and Sae Woo Nam and Yoshihiro Nambu and Seigo Takahashi and Wakako Maeda and Ken-ichiro Yoshino and Shigehito Miki and Burm Baek and Zhen Wang and Akio Tajima and Masahide Sasaki and Akihisa Tomita},
journal= {arXiv preprint arXiv:0805.2193},
year = {2009}
}
Comments
7 pages, 3 figures, v2 : We added a comment on the significance of our work, some minor corrections, and references