The effect of balanced homodyne detection on continuous variable quantum key distribution
Jin-jian Chen, Zheng-Fu Han, Zhao Yi-Bo, Gui Youzhen, Guo Guang-Can, 中国科学技术大学，中科院量子信息重点实验室，合肥 230026 · Acta Physica Sinica · 2007
Different from single photon quantum key distribution, continuous variable quantum key distribution uses the balanced homodyne detection. In this paper, the detection error of balanced homodyne caused by vacuum noise of the local light and unbalance of beam splitter is analyzed, the maximal safe distance limited by the electronic noise of balance homodyne detector is given, finally, the relationship between the noise of balanced homodyne detection and key rate are shown.