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

Published

Author(s)

Akihiro Tanaka, Mikio Fujiwara, Sae Woo Nam, Yoshihiro Nambu, Seigo Takahashi, Wakako Maeda, Ken-ichiro Yoshino, Shigehito Miki, Burm Baek, Z. Wang, Akio Tajima, Masahide Sasaki, Akihisa Tomita

Abstract

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 high sifted key rate of 2.4 kbps and a low quantum bit error ratio (QBER) of 2.9%. The asymptotic secure key rate was estimated to be 0.78-0.82 kbps from the transmission data with decoy method of average photon numbers 0, 0.15, and 0.4 photons/pulse.
Citation
Optics Express
Volume
16
Issue
15

Keywords

quantum key distribution, decoy states, BB84, superconducting detectors, sspd

Citation

Tanaka, A. , Fujiwara, M. , Nam, S. , Nambu, Y. , Takahashi, S. , Maeda, W. , Yoshino, K. , Miki, S. , Baek, B. , Wang, Z. , Tajima, A. , Sasaki, M. and Tomita, A. (2008), Ultra fast quantum key distribution over a 97-km installed telecom fiber with wavelength-division-multiplexing clock synchronization, Optics Express, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=33012 (Accessed April 22, 2024)
Created July 20, 2008, Updated October 12, 2021