TY - JOUR
T1 - Free space optical secret key agreement
AU - Endo, Hiroyuki
AU - Fujiwara, Mikio
AU - Kitamura, Mitsuo
AU - Tsuzuki, Orie
AU - Ito, Toshiyuki
AU - Shimizu, Ryosuke
AU - Takeoka, Masahiro
AU - Sasaki, Masahide
N1 - Funding Information:
ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan).
Publisher Copyright:
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
PY - 2018/9/3
Y1 - 2018/9/3
N2 - Free space optical (FSO) communications are enabling high-speed global wireless networks. Thanks to the highly directional nature of laser beam, they also yield a greater security advantage over radio frequency counterparts. When combined with a scheme of secret key agreement (SKA), FSO-SKA can establish at high speed a symmetric secret key which cannot be decrypted even by unbounded computer resources. Although there have been many theoretical studies on SKA, experimental investigations have been quite lacking, especially on quantifying eavesdropping risks and secret key rates in realistic environment. Here, we report the first full-field implementations of FSO-SKA in a 7.8-km terrestrial link with a probing station, enabling the estimation of eavesdropping risks. We attain the final key rates from 100 kbps to 7.77 Mbps under various atmospheric and beaming conditions even with total losses of 55dB or higher, in which known quantum key distribution schemes attain impractically low key rates.
AB - Free space optical (FSO) communications are enabling high-speed global wireless networks. Thanks to the highly directional nature of laser beam, they also yield a greater security advantage over radio frequency counterparts. When combined with a scheme of secret key agreement (SKA), FSO-SKA can establish at high speed a symmetric secret key which cannot be decrypted even by unbounded computer resources. Although there have been many theoretical studies on SKA, experimental investigations have been quite lacking, especially on quantifying eavesdropping risks and secret key rates in realistic environment. Here, we report the first full-field implementations of FSO-SKA in a 7.8-km terrestrial link with a probing station, enabling the estimation of eavesdropping risks. We attain the final key rates from 100 kbps to 7.77 Mbps under various atmospheric and beaming conditions even with total losses of 55dB or higher, in which known quantum key distribution schemes attain impractically low key rates.
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U2 - 10.1364/OE.26.023305
DO - 10.1364/OE.26.023305
M3 - Article
C2 - 30184984
AN - SCOPUS:85052698293
SN - 1094-4087
VL - 26
SP - 23305
EP - 23332
JO - Optics Express
JF - Optics Express
IS - 18
ER -