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An auto-compensating and efficient differential phase shift quantum key distribution system

Lu Hong Liang Rui-Sheng Lu Yi-Qun Guo Bang-Hong Liu Song-Hao Lin Yi-Man

An auto-compensating and efficient differential phase shift quantum key distribution system

Lu Hong, Liang Rui-Sheng, Lu Yi-Qun, Guo Bang-Hong, Liu Song-Hao, Lin Yi-Man
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  • We present an improved differential phase shift quantum key distribution schemewhich features auto-compensation,high efficiency,and excellent practicality. Alice modulates continuous laser using an intensity modulator based on polarization to generate coherent pulse train. Bob employs a Fraday-Michelson interferometer instead of a traditional M-Z interferometer,which automatically compensates for the polarization mode dispersion caused by the changes of environment and improves the stability of the interference visibility. The present scheme not only has a simpler configuration,but also offers a higher key creation efficiency than traditional schemes. Furthermore,it enhances the security of the system. With the proposed experimental setup,a stable quantum key distribution was performed over 80km fiber with a quantum bit-error rate of less than 4%.
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  • Received Date:  18 September 2006
  • Accepted Date:  13 November 2006
  • Published Online:  20 July 2007

An auto-compensating and efficient differential phase shift quantum key distribution system

  • 1. (1)佛山科学技术学院光电子与物理学系,佛山 528000; (2)华南师范大学信息光电子科技学院光子信息技术广东省高校重点实验室,广州 510631; (3)华南师范大学信息光电子科技学院光子信息技术广东省高校重点实验室,广州 510631;佛山科学技术学院光电子与物理学系,佛山 528000

Abstract: We present an improved differential phase shift quantum key distribution schemewhich features auto-compensation,high efficiency,and excellent practicality. Alice modulates continuous laser using an intensity modulator based on polarization to generate coherent pulse train. Bob employs a Fraday-Michelson interferometer instead of a traditional M-Z interferometer,which automatically compensates for the polarization mode dispersion caused by the changes of environment and improves the stability of the interference visibility. The present scheme not only has a simpler configuration,but also offers a higher key creation efficiency than traditional schemes. Furthermore,it enhances the security of the system. With the proposed experimental setup,a stable quantum key distribution was performed over 80km fiber with a quantum bit-error rate of less than 4%.

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