论文标题
与自我测量的GHz门控超导NBN纳米线的同步单光子检测
Synchronous single-photon detection with self-resetting GHz-gated superconducting NbN nanowires
论文作者
论文摘要
我们展示了谐振器耦合超导纳米式单光子检测器的GHz门控操作，适用于同步应用。与常规的DC偏置纳米线探测器相比，此方法可防止检测器闩锁，并可以抑制黑暗计数和背景噪声。使用3.8 GHz的门控频率和快速同步的激光二极管，我们表明检测器的操作点遵循振荡电流，其检测效率取决于偏差的相对频率和相位和调制光信号。获得的实验结果与模拟非常吻合，表明，在当前依赖性检测效率的明显饱和的情况下，可以在宽范围内调整门控探测器的占空比。此操作模式可以适用于诸如量子密钥分布和飞行时间激光范围的应用。
We demonstrate a GHz-gated operation of resonator-coupled superconducting nanowire single-photon detectors suitable for synchronous applications. In comparison with conventional dc-biased nanowire detectors, this method prevents the detector from latching and can suppress dark counts and background noise. Using a gating frequency of 3.8 GHz and a fast, synchronized laser diode, we show that the detector's operation point follows the oscillating current and its detection efficiency depends on the relative frequency and phase of the bias and modulated optical signal. The obtained experimental results are in good agreement with simulations, showing that the duty cycle of a gated detector can be adjusted in a wide range in case of a pronounced saturation of the current-dependent detection efficiency. This operation mode could be suitable for applications such as quantum key distribution and time-of-flight laser ranging.
