Stable quantum key distribution with polarization control
Jie Chen, Yao Li, Guang Ming Wu, Zeng He-Ping, 华东师范大学光谱学与波谱学教育部重点实验室, 上海 200062 · Acta Physica Sinica · 2007
In this paper, we promote a principle of polarization feedback which keeps polarization states stable in long-distance fiber. It is quite difficult to realize long-term stable quantum key distribution (QKD) with polarization encoding due to the effect of irregular polarization fluctuation in single mode fiber. We have designed a polarization feedback control system to compensate for the birefringence. And a polarization encoded QKD experiment has been realized in 100km fiber.