Practical non-orthogonal decoy state quantum key distribution with heralded single photon source
Mi Jing-Long(米景隆), Wang Fa-Qiang(王发强)†, Lin Qing-Qun(林青群), and Liang Rui-Sheng(梁瑞生)
Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510631, China
Abstract Recently the performance of the quantum key distribution (QKD) is substantially improved by the decoy state method and the non-orthogonal encoding protocol, separately. In this paper, a practical non-orthogonal decoy state protocol with a heralded single photon source (HSPS) for QKD is presented. The protocol is based on 4 states with different intensities, i.e. one signal state and three decoy states. The signal state is for generating keys; the decoy states are for detecting the eavesdropping and estimating the fraction of single-photon and two-photon pulses. We have discussed three cases of this protocol, i.e. the general case, the optimal case and the special case. Moreover, the final key rate over transmission distance is simulated. For the low dark count of the HSPS and the utilization of the two-photon pulses, our protocol has a higher key rate and a longer transmission distance than any other decoy state protocol.
Received: 12 July 2007
Revised: 29 October 2007
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 60578055) and the
State Key Development Program for
Basic Research of China (Grant No 2007CB307001).
Cite this article:
Mi Jing-Long(米景隆), Wang Fa-Qiang(王发强), Lin Qing-Qun(林青群), and Liang Rui-Sheng(梁瑞生) Practical non-orthogonal decoy state quantum key distribution with heralded single photon source 2008 Chin. Phys. B 17 1178
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