Generally, a superconducting nanowire single-photon detector (SNSPD) is composed of wires with a typical width of $\sim 100\mathrm{nm}$. Recent studies have found that superconducting strips with a micrometer-scale width can also detect single photons. Compared with the SNSPD covering the same area, the superconducting microstrip single-photon detector (SMSPD) has smaller kinetic inductance, higher working current, and lower requirements in fabrication accuracy, providing potential applications in the development of ultralarge active area detectors. However, the study of SMSPD is still in its infancy, and the realization of its high-performance and practical use remains an open question. This study demonstrates a NbN SMSPD with a nearly saturated system detection efficiency (SDE) of $\sim 92.2\%$ at a dark count rate of $\sim 200\mathrm{cps}$, a polarization sensitivity of $\sim 1.03$, and a minimum timing jitter of $\sim 48\mathrm{ps}$ at the telecom wavelength of 1550 nm when coupled with a single-mode fiber and operated at 0.84 K. Furthermore, the detector’s SDE is over 70% when operated at a 2.1 K closed-cycle cryocooler.

中文翻译：

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超导微带单光子探测器，1550nm系统探测效率超过90%

通常，超导纳米线单光子探测器（SNSPD）由典型宽度为 $～100\mathrm{纳米}$. 最近的研究发现，微米级宽度的超导带也可以探测到单光子。与覆盖相同面积的SNSPD相比，超导微带单光子探测器(SMSPD)具有更小的动感、更高的工作电流和更低的制造精度要求，为超大有源面积探测器的发展提供了潜在的应用。然而，SMSPD的研究还处于起步阶段，其高性能和实用化的实现仍然是一个悬而未决的问题。本研究证明了 NbN SMSPD 的系统检测效率 (SDE) 接近饱和$～92.2\%$ 在暗计数率为 $～200\mathrm{cps}$, 极化灵敏度为 $～1.03$，以及最小定时抖动 $～48\mathrm{ps}$ 当与单模光纤耦合并在 0.84 K 下运行时，在 1550 nm 的电信波长下。此外，在 2.1 K 闭环低温冷却器下运行时，探测器的 SDE 超过 70%。