发表机构
NASA Jet Propulsion Laboratory, California Institute of Technology; Department of Applied Physics and Material Science, California Institute of Technology; National Institute of Standards and Technology; Department of Applied Physics Quantum Technologies, Université de Genève（美国国家航空航天局喷气推进实验室，加州理工学院; 加州理工学院应用物理与材料科学系; 美国国家标准与技术研究院; 日内瓦大学应用物理量子技术系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过实验和TDGL建模表征了20微米宽SSPD的位置相关时序抖动，提出平行超导轨架构主动重新分配超电流以最小化延迟失配并抑制暗计数，从而提升器件性能。
AI 中文摘要
超导条带单光子探测器（SSPDs）已成为传统纳米线对应物的可扩展、宽条带变体。尽管具有改善的光学填充因子和增强的信噪比等实际优势，但控制这些微尺度几何结构的基本探测物理仍 largely 未被探索。在此，我们研究了20微米宽硅化钨SSPD的底层光响应，展示了在532纳米波长下经转换速率校正的时序抖动为13.2皮秒，在1550纳米下为20.5皮秒，同时内部探测效率在高达1550纳米范围内饱和。利用聚焦自由空间光学扫描，我们揭示了探测器时序抖动受到边缘与中心吸收事件之间空间依赖的转换速率的强烈影响。为减轻这一影响，我们采用平行超导轨架构主动重新分配超电流。这种原位调谐最小化了延迟失配，并减轻了热激活的固有暗计数，扩展了器件在更高温度下工作的能力。最后，将这些动力学与时间依赖金兹堡-朗道（TDGL）建模进行比较，阐明了位置依赖光响应的物理起源，强调了超导轨或专用读出电子学如何减轻对时序抖动的不利影响。
英文摘要
Superconducting strip single-photon detectors (SSPDs) have emerged as scalable, wide-strip variants of traditional nanowire counterparts. Despite practical advantages including improved optical fill factors and enhanced signal-to-noise ratios the fundamental detection physics governing these micro-scale geometries remains largely unexplored. Here, we investigate the underlying photoresponse of a 20 um-wide tungsten silicide SSPD, demonstrating a slew-rate-corrected timing jitter of 13.2 ps at 532 nm and 20.5 ps at 1550 nm, alongside saturated internal detection efficiency up to 1550 nm. Using focused free-space optical scanning, we reveal that detector timing jitter is strongly influenced by a spatially dependent slew rate between edge and center absorption events. To mitigate this impact, we utilize a parallel superconducting rail architecture to actively redistribute supercurrent. This in-situ tuning minimizes the latency mismatch and mitigates thermally activated intrinsic dark counts, extending the device's ability to operate at higher temperatures. Finally, comparing these dynamics with time-dependent Ginzburg-Landau (TDGL) modeling elucidates the physical origins of the position-dependent photoresponse, highlighting how superconducting rails or specialized readout electronics can mitigate negative impacts on timing jitter.
