Zhou Nan, Jiang Wen-Hao, Chen Luo-Kan, Fang Yu-Qiang, Li Zheng-Da, Liang Hao, Chen Yu-Ao, Zhang Jun, Pan Jian-Wei
Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China and CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Rev Sci Instrum. 2017 Aug;88(8):083102. doi: 10.1063/1.4986038.
Silicon single-photon detectors (SPDs) are the key devices for detecting single photons in the visible wavelength range. Here we present high detection efficiency silicon SPDs dedicated to the generation of multiphoton entanglement based on the technique of high-frequency sine wave gating. The silicon single-photon avalanche diode components are acquired by disassembling 6 commercial single-photon counting modules (SPCMs). Using the new quenching electronics, the average detection efficiency of SPDs is increased from 68.6% to 73.1% at a wavelength of 785 nm. These sine wave gating SPDs are then applied in a four-photon entanglement experiment, and the four-fold coincidence count rate is increased by 30% without degrading its visibility compared with the original SPCMs.
硅基单光子探测器（SPD）是在可见波长范围内探测单光子的关键器件。在此，我们展示了基于高频正弦波门控技术的、用于产生多光子纠缠的高探测效率硅基SPD。通过拆解6个商用单光子计数模块（SPCM）获取硅基单光子雪崩二极管组件。使用新型猝灭电子学，在785nm波长下，SPD的平均探测效率从68.6%提高到了73.1%。然后将这些正弦波门控SPD应用于四光子纠缠实验，与原始SPCM相比，四倍符合计数率提高了30%，且不降低其可见度。
