Long-distance entanglement-based quantum key distribution over optical fiber

Honjo, T. et al. (2008) Long-distance entanglement-based quantum key distribution over optical fiber. Optics Express, 16(23), pp. 19118-19126. (doi: 10.1364/OE.16.019118)

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We report the first entanglement-based quantum key distribution (QKD) experiment over a 100-km optical fiber. We used superconducting single photon detectors based on NbN nanowires that provide high-speed single photon detection for the 1.5-µm telecom band, an efficient entangled photon pair source that consists of a fiber coupled periodically poled lithium niobate waveguide and ultra low loss filters, and planar lightwave circuit Mach-Zehnder interferometers (MZIs) with ultra stable operation. These characteristics enabled us to perform an entanglement-based QKD experiment over a 100-km optical fiber. In the experiment, which lasted approximately 8 hours, we successfully generated a 16 kbit sifted key with a quantum bit error rate of 6.9 % at a rate of 0.59 bits per second, from which we were able to distill a 3.9 kbit secure key.

Item Type:Articles
Additional Information:This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/OE.16.019118. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Glasgow Author(s) Enlighten ID:Hadfield, Professor Robert
Authors: Honjo, T., Nam, S.W., Takesue, H., Zhang, Q., Kamada, H., Nishida, Y., Tadanaga, O., Asobe, M., Baek, B., Hadfield, R., Miki, S., Fujiwara, M., Sasaki, M., Wang, Z., Inoue, K., and Yamamoto, Y.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optics Express
Publisher:Optical Society of America
Copyright Holders:Copyright © 2008 Optical Society of America
First Published:First published in Optics Express 16(23):19118-19126
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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