An improved quantum key distribution protocol based on second-order coherence

作者：Xiong, J^*; Zeng, GH; Zhou, NR

来源：Optics Communications, 2006, 260(1): 351-354.

DOI：10.1016/j.optcom.2005.10.050

• quantum key distribution
• second-order coherence
• HBT intensity interferometer
• quantum cryptography

We improve the quantum key distribution protocol proposed by Pereira et al. [S.F. Pereira, Z.Y. On. H.J. Kimble, Phys. Rev. A 62 (2000) 042311] by employing the second-order coherence of optical fields, which can be easy experimentally measured with a Hanbury-Brown and Twiss intensity interferometer. It is shown that eavesdropping can be directly detected without sacrificing extra secret bits as test key. The efficiency of the improved system is enhanced greatly, since no secret bit needs to be discarded.

• 出版日期2006-4-1
• 单位上海交通大学