Practical non-orthogonal decoy state quantum key distribution with heralded single photon source |
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Authors: | Mi Jing-Long Wang Fa-Qiang Lin Qing-Qun and Liang Rui-Sheng |
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Affiliation: | Laboratory of Photonic Information Technology, School for
Information and Optoelectronic Science and Engineering,
South
China
Normal University, Guangzhou 510631, China |
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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. |
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Keywords: | quantum key distribution decoy
state non-orthogonal encoding protocol heralded single photon
source |
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