1.2-GHz Balanced Homodyne Detector for Continuous-Variable Quantum Information Technology

IEEE Photonics Journal

Zhengyu Li¹  Hong Guo¹  Xiaoxiong Zhang²  Song Yu²  Yichen Zhang² 

[1] State Key Laboratory of Advanced Optical Communications Systems and Networks, School of Electronics Engineering and Computer Science, Center for Quantum Information Technology, Center for Computational Science and Engineering, Peking University, Beijing, China;State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China;

关键词: Balanced homodyne detector;    bandwidth;    quantum to classical noise ratio;    common mode rejection ratio;    continuous-variable quantum key distribution;    quantum random number generator;   

DOI  :  10.1109/JPHOT.2018.2866514

来源: DOAJ

【 摘 要 】

Balanced homodyne detector (BHD) that can measure the field quadratures of coherent states has been widely used in a range of quantum information technologies. Generally, the BHD tends to suffer from narrow bands and an expanding bandwidth behavior usually traps into a compromise with the gain, electronic noise, and quantum to classical noise ratio, etc. In this paper, we design and construct a wideband BHD based on radio frequency and integrated circuit technology. Our BHD shows bandwidth behavior up to 1.2 GHz and its quantum to classical noise ratio is around 18 dB. Simultaneously, the BHD has a linear performance with a gain of 4.86 k and its common mode rejection ratio has also been tested as 57.9 dB. With this BHD, the secret key rate of continuous-variable quantum key distribution system has a potential to achieve 66.55 Mb/s and 2.87 Mb/s, respectively, at the transmission distance of 10 and 45 km. Besides, with this BHD, the generation rate of quantum random number generator could reach up to 6.53 Gb/s.

【 授权许可】

Unknown