We experimentally study timing jitter of single-photon detection by NbN superconducting strips with width $w$ ranging from 190,nm to 3,$\mu$m. We find that timing jitter of both narrow (190,nm) and micron-wide strips is about 40,ps at currents where internal detection efficiency $\eta$ saturates and it is close to our instrumental jitter. We also calculate intrinsic timing jitter in wide strips using modified time-dependent Ginzburg-Landau equation coupled with two-temperature model. We find that with increasing width the intrinsic timing jitter increases and the effect is most considerable at currents where a rapid growth of $\eta$ changes to saturation. We relate it with complicated vortex/antivortex dynamics which depends on photon’s absorption site across the strip and its width. The model also predicts that at current close to depairing current the intrinsic timing jitter of wide strip could be about $\hslash /k_B{T}_c$ ($T_c$ is a critical temperature of superconductor), i.e. same as for narrow strip.

中文翻译：

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NbN超导微带单光子探测器中的定时抖动

我们实验研究了NbN超导带的单光子检测的定时抖动的宽度 $w$ 范围从190nm到3，$\mu$米 我们发现，在内部检测效率较高的电流下，窄带（190，nm）和微米级带的时序抖动约为40ps。$\eta$饱和，接近我们的乐器抖动。我们还使用修正的与时间相关的Ginzburg-Landau方程和两个温度模型，计算了宽条带中的固有时序抖动。我们发现，随着宽度的增加，固有时序抖动会增加，并且在电流快速增长的电流中，影响最为明显。$\eta$变为饱和。我们将其与复杂的涡旋/反涡旋动力学联系起来，这取决于光子在条带上的吸收位置及其宽度。该模型还预测，在接近解耦电流的情况下，宽条带的固有定时抖动可能约为$\hslash /{ķ}_{乙}{Ť}_C$ （${Ť}_C$ 是超导体的临界温度），即与窄带相同。