Analysis of the coefficient of QBER and its influence on QKD

Feng Zhao; Jing-ling Li

doi:10.1117/12.866065

4 November 2010 Analysis of the coefficient of QBER and its influence on QKD

Feng Zhao, Jing-ling Li

Proceedings Volume 7846, Quantum and Nonlinear Optics; 78460J (2010) https://doi.org/10.1117/12.866065
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

The quantum bit error rate (QBER) based on the weak coherent pulse's quantum key distribution is analyzed. It is indicate that the coefficient of QBER is not a constant but is increased exponentially with the transmission distance. Based on the three groups' experimental data, the function fitting for the coefficient of QBER has been done respectively. We discovered that these fitting functions have the same function form. Subsequently we use fitting function to optimize the mean photon number for the BB84 quantum key distribution with decoy states. The result shown that the optimized mean photon number depend on the transmission distance. Using these results and the GYS's experimental parameters we compared the key generation rates proposed by Lo et al with the modified one. We find that the latter is superior to the former within a certain distance.

Citation Download Citation

Feng Zhao and Jing-ling Li "Analysis of the coefficient of QBER and its influence on QKD", Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460J (4 November 2010); https://doi.org/10.1117/12.866065

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