An improved quantum key distribution protocol based on second-order coherence |
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| Authors: | Jin Xiong Guihua Zeng Nanrun Zhou |
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| Affiliation: | The State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication Systems, Department of Electronic Engineering, Shanghai Jiaotong University, Room 602, No. 28, Lane 865, Dongchuan Road, Shanghai 200240, China |
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| Abstract: | We improve the quantum key distribution protocol proposed by Pereira et al. [S.F. Pereira, Z.Y. Ou, 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. |
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| Keywords: | 03.67.Dd 03.67.HK 42.50.Ar |
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