Yuan Cao, Hao Liang, Juan Yin, Hai-Lin Yong, Fei Zhou, Yu-Ping Wu, Ji-Gang Ren, Yu-Huai Li, Ge-Sheng Pan, Tao Yang, Xiong-Feng Ma, Cheng-Zhi Peng, Jian-Wei Pan
We report a free-space entanglement-based quantum key distribution experiment, implementing the efficient BB84 protocol between two sites which are 15.3 km apart. Photon pairs from a polarization-entangled source are distributed through two 8-km free-space optical links. An optimal bias 20:80 between the X and Z basis is used. A post-processing scheme with finite-key analysis is applied to extract the final secure key. After three-hour continuous operation at night, a 4146-bit secure key is obtained, with a final key rate of 0.123 bit per raw key bit. Our results experimentally demonstrate the efficient BB84 protocol which is potentially useful for the ground-satellite quantum communication.
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http://arxiv.org/abs/1304.6462
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