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Improved energy resolution of a superconducting single-photon detector

机译:改进的超导单光子探测器的能量分辨率

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We demonstrated successful operation of an NbN single photon detector in the temperature range from 6 K to 1.2 K using a ~3He sorption refrigerator combined with a pulse-tube mechanical cooler. The detector was read out either by microwave amplifiers or by a broadband SQUID-amplifier that limited the maximum counting rate to 10~7 counts per second. This counting rate was only one third of the maximum rate provided by the detector. Besides an increase in the quantum efficiency in the visible and near-infrared spectral range with the decrease of the operation temperature, we found a more than twofold improvement in the energy resolution as compared to earlier demonstrated 1 eV at 6.5 K. The noise equivalent power estimated at 4.2 K for visible light was better than 10~(-18) W Hz~(-1/2). We verified that the lowest achieved dark count rate was still caused by the harsh electrical conditions in the mechanical cooler.
机译:我们证明了使用〜3He吸收式制冷机结合脉冲管机械冷却器在6 K至1.2 K的温度范围内NbN单光子探测器的成功运行。探测器是通过微波放大器或宽带SQUID放大器读出的,该放大器将最大计数率限制为每秒10〜7个计数。此计数率仅为检测器提供的最大计数率的三分之一。除了随着工作温度的降低,可见光和近红外光谱范围内的量子效率提高外,我们还发现,与之前在6.5 K下的1 eV相比,能量分辨率提高了两倍以上。噪声等效功率可见光在4.2 K下的估计值优于10〜(-18)W Hz〜(-1/2)。我们验证了最低的暗计数率仍然是由机械冷却器中恶劣的电气条件引起的。

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