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Zhang, Weijun; Huang, Jia; Zhang, Chengjun; You, Lixing; Lv, Chaolin; Zhang, Lu; Li, Hao; Wang, Zhen; Xie, Xiaoming
IEEE transactions on applied superconductivity, 08/2019, Letnik: 29, Številka: 5Journal Article
Increasing the count rate (CR) is one of the key issues in the development of superconducting nanowire single-photon detectors (SNSPDs) for different applications. This study aims to design, fabricate, and analyze a 16-pixel interleaved nanowire SNSPD array, which exhibits a system detection efficiency (SDE) of 72% and a dark CR of 100 Hz at a low-photon-flux limit and a wavelength of 1550 nm. By exploiting the increased pixel number and reduced dead time (<;5 ns) of each nanowire, the SNSPD array attained a maximum CR of 1.5 GHz with an SDE of ~12% at a photon flux of 1.26 × 10 10 photons/s. Moreover, the SNSPD achieved a photon number resolution of up to 16 photons.
