Ultra fast quantum key distribution over a 97 km installed telecom fiber with wavelength-division multiplexing clock synchronization

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Authors
Tanaka, Akihiro
Fujiwara, Mikio
Nam, Sae Woo
Nambu, Yoshihiro
Takahashi, Seigo
Maeda, Wakako
Yoshino, Ken-ichiro
Miki, Shigehito
Baek, Burm
Wang, Zhen
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Abstract
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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.
Comment: 7 pages, 3 figures, v2 : We added a comment on the significance of our work, some minor corrections, and references
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Quantum Physics
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