中文摘要：

超导的 nanowire 的表演单个光子的察觉者(SNSPD ) 基于低 T < 潜水艇 class= “ a-plus-plus ” > C 材料强烈取决于操作温度。我们基于做的铌制作了红外线敏感的铌 SNSPD (Nb *) 电影并且在 He-3 cryocooler 测量了他们。批评水流在 0.3 点来临到配对 de 水流 ? K。与在温度的减少，因此，我们在 1,521 的波长观察了计数率的单调的增加 ? nm 和黑暗计数率的指数的减少根本偏导水流。为做的 Nb 设备的黑暗计数的可能的起源也被讨论。

英文摘要：

Performances of superconducting nanowire single-photon detectors （SNSPDs） based on low Tc mate- rials strongly depend on the operating temperatures. We have fabricated infrared-sensitive niobium SNSPDs based on doped niobium （Nb＊） films and measured them in He-3 cryocooler. The critical current approaches to the de-pair- ing current at 0.3 K. Therefore, with the decrease in tem- peratures, we have observed a monotonous increase of count rate at the wavelength of 1,521 nm and exponential decrease of dark count rate at all bias currents. The possible origin of dark counts for doped Nb devices is also discussed.