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Origin and mechanism of the wavelength-dependent timing jitter in superconducting nanowire
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2020-11-27 , DOI: 10.1117/1.jnp.14.046012
Jianghua Guo 1 , Youcheng Tian 1 , Lingxin Long 1 , Hengbin Zhang 2 , Junku Liu 2 , Lin Xiao 2 , Jun Xie 2
Affiliation  

Abstract. A 2D hot spot diffusion model for describing the superconducting nanowire response to a single photon is presented. Compared to the 1D hot belt model, the 2D hot spot model can capture the initial stage of the hot spot evolution after photon absorption, which is beneficial for achieving a more comprehensive understanding of the origins and underlying physics of the timing jitter in superconducting nanowire-based single-photon detectors. Based on the established 2D diffusion model, the cross-section effect induced by the random radial position of the photon absorption is investigated, which can qualitatively explain the asymmetry and non-Gaussian shape of the probability density function (PDF) distributions of the time delay. Furthermore, the shift of the right half of the PDF distributions with increasing photon wavelength can also be clarified in the framework of the innovative 2D diffusion model. Considering the spatial inhomogeneity along the nanowire, the calculated results of the timing jitter based on the Monte Carlo methods are in good agreement with the experimental observations. The proposed 2D hot spot diffusion model will not only shed light on the origin and influence of the timing jitter but also reveal the working principle of superconducting nanowire devices.

中文翻译:

超导纳米线中波长相关时间抖动的起源和机制

摘要。提出了用于描述超导纳米线对单个光子的响应的二维热点扩散模型。与一维热点模型相比,二维热点模型可以捕捉到光子吸收后热点演化的初始阶段,有利于更全面地了解超导纳米线中时间抖动的起源和潜在物理机制——基于单光子探测器。在建立的二维扩散模型的基础上,研究了光子吸收的随机径向位置引起的截面效应,可以定性地解释时间延迟的概率密度函数(PDF)分布的不对称性和非高斯形状. 此外,随着光子波长的增加,PDF 分布的右半部分的移动也可以在创新的 2D 扩散模型的框架中得到澄清。考虑到沿纳米线的空间不均匀性,基于蒙特卡罗方法的时序抖动计算结果与实验观察结果吻合较好。所提出的二维热点扩散模型不仅可以阐明时序抖动的起源和影响,还可以揭示超导纳米线器件的工作原理。
更新日期:2020-11-27
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