Superconducting nanowire single-photon detectors (SNSPDs) are an enabling technology for myriad quantum-optics experiments that require high-efficiency detection, large count rates, and precise timing resolution. The system detection efficiencies (SDEs) for fiber-coupled SNSPDs have fallen short of theoretical predictions of near unity by at least 7%, with the discrepancy being attributed to scattering, material absorption, and other SNSPD dynamics. We optimize the design and fabrication of an all-dielectric layered stack and fiber coupling package in order to achieve $98.0 \pm 0.5\%$ SDE, measured for single-mode-fiber guided photons derived from a highly attenuated 1550 nm continuous-wave laser. This enforces a smaller bound on the scattering and absorption losses in such systems and opens the use of SNSPDs for scenarios that demand high-SDE for throughput and fidelity.

中文翻译：

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超导纳米线单光子探测器，在1550 nm处具有98％的系统探测效率

超导纳米线单光子检测器（SNSPD）是用于要求高效检测，大计数率和精确定时分辨率的众多量子光学实验的一项启用技术。光纤耦合SNSPD的系统检测效率（SDE）低于理论预测的接近统一至少7％，其差异归因于散射，材料吸收和其他SNSPD动态。我们优化了全介电层状叠层和光纤耦合封装的设计和制造，以实现98.0美元\ pm 0.5 \％$SDE，针对源自高度衰减的1550 nm连续波激光器的单模光纤引导光子进行测量。这在此类系统中对散射和吸收损耗施加了较小的限制，并为需要高SDE吞吐量和保真度的场景打开了SNSPD的使用。