A low-noise photodetector is a basic tool for the research of quantum information processing. We present a specially designed low-noise photoelectric detector with a bandwidth of 130 MHz, using a transimpedance amplif...A low-noise photodetector is a basic tool for the research of quantum information processing. We present a specially designed low-noise photoelectric detector with a bandwidth of 130 MHz, using a transimpedance amplification circuit. Based on the detailed calculation of the dependence on each parameter of the detector,a useful method of how to design a low-noise and broadband photodetector is provided. When the optical power is between 1.0 and 16 m W, the photodetector has a good linear response to the injected light. Its electronics noise power is below-77 d Bm, which is within the whole bandwidth. When the incident light power is 2 m W, the output noise powers are 10.0, 8.0, and 6.0 d B higher than the corresponding electronics noise within the bandwidth of 1–50, 50–90, and 90–130 MHz, respectively, which is in good agreement with the theoretical prediction.Thus, this photoelectric detector could have good application prospects in quantum communication and an optical cavity locking system.展开更多
基金supported by the Key Project of the Ministry of Science and Technology of China(No.2016YFA0301402)the Natural Science Foundation of China(Nos.11322440,11474190,and 11304190)+1 种基金the FOK YING TUNG Education Foundation,Natural Science Foundation of Shanxi Province(No.2014021001)the Program for Sanjin Scholars of Shanxi Province
文摘A low-noise photodetector is a basic tool for the research of quantum information processing. We present a specially designed low-noise photoelectric detector with a bandwidth of 130 MHz, using a transimpedance amplification circuit. Based on the detailed calculation of the dependence on each parameter of the detector,a useful method of how to design a low-noise and broadband photodetector is provided. When the optical power is between 1.0 and 16 m W, the photodetector has a good linear response to the injected light. Its electronics noise power is below-77 d Bm, which is within the whole bandwidth. When the incident light power is 2 m W, the output noise powers are 10.0, 8.0, and 6.0 d B higher than the corresponding electronics noise within the bandwidth of 1–50, 50–90, and 90–130 MHz, respectively, which is in good agreement with the theoretical prediction.Thus, this photoelectric detector could have good application prospects in quantum communication and an optical cavity locking system.
