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Proceedings Paper

Gaussian-modulated coherent state quantum key distribution experiment over 20km telecommunication fiber
Author(s): Bing Qi; Lei-Lei Huang; Yue-Meng Chi; Li Qian; Hoi-Kwong Lo
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Paper Abstract

In most implementations of quantum-key-distribution (QKD) protocols the secure keys originate from single-photon signals. However, due to the unavoidable channel losses and the low efficiencies of single photon detectors, the key generation rate of a single-photon QKD system is low. Recently, there has been a growing interest in the Gaussianmodulated coherent state (GMCS) QKD protocol because it can be implemented with conventional laser sources and high efficiency homodyne-detectors. Here, we present our experimental results with a fully fiber-based one-way GMCS QKD system. Our system employed a double Mach-Zehnder interferometer (MZI) configuration in which the weak quantum signal and the strong local-oscillator (LO) go through the same fiber between Alice and Bob. We employed two novel techniques to suppress system excess noise. First, to suppress the LO's leakage, an important contribution to the excess noise, we implemented a scheme combining polarization and frequency multiplexing, achieving an extinction ratio of 70dB. Second, to further minimize the system excess noise due to phase drift of the double MZI, the sender simply remaps her data by performing a rotation operation. Under a "realistic model", the secure key rates determined with a 5km and a 20km fiber link are 0.3bit/pulse and 0.05bit/pulse, respectively. These key rates are significantly higher than that of a practical BB84 QKD system.

Paper Details

Date Published: 5 September 2008
PDF: 9 pages
Proc. SPIE 7092, Quantum Communications and Quantum Imaging VI, 70920J (5 September 2008); doi: 10.1117/12.793854
Show Author Affiliations
Bing Qi, Univ. of Toronto (Canada)
Lei-Lei Huang, Univ. of Toronto (Canada)
Yue-Meng Chi, Univ. of Toronto (Canada)
Li Qian, Univ. of Toronto (Canada)
Hoi-Kwong Lo, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 7092:
Quantum Communications and Quantum Imaging VI
Ronald E. Meyers; Yanhua Shih; Keith S. Deacon, Editor(s)

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