论文标题
分形超导纳米线检测具有84％系统检测效率的红外单光子，1.02极化敏感性和20.8 PS时机分辨率
Fractal superconducting nanowires detect infrared single photons with 84% system detection efficiency, 1.02 polarization sensitivity, and 20.8 ps timing resolution
论文作者
论文摘要
超导纳米局单光子探测器（SNSPDS）与其他优点结合其其他优点的近乎统一系统检测效率（SDE）和出色的定时分辨率已实现了许多经典和量子光子应用。但是，基于蜿蜒的纳米线的普遍设计使SDE取决于入射光子的极化状态。对于非极化光，高SDE的主要优点将受到损害，这可能对光子饥饿的应用有害。 Here, we create SNSPDs with an arced fractal geometry that almost completely eliminates this polarization dependence of the SDE, and we experimentally demonstrate 84$\pm$3$\%$ SDE, 1.02$^{+0.06}_{-0.02}$ polarization sensitivity at the wavelength of 1575 nm, and 20.8 ps timing jitter in a 0.1-W closed-cycle Gifford-McMahon冷冻机，在2.0 K的基本温度下。此演示提供了一种新颖的，实用的设备结构，可在可见的，近红外的频谱范围内进行操作，并为极度不敏感的单个光子检测铺平了道路，并铺平了较高的SDE和高时间分辨率。
The near-unity system detection efficiency (SDE) and excellent timing resolution of superconducting nanowire single-photon detectors (SNSPDs), combined with their other merits, have enabled many classical and quantum photonic applications. However, the prevalent design based on meandering nanowires makes SDE dependent on the polarization states of the incident photons; for unpolarized light, the major merit of high SDE would get compromised, which could be detrimental for photon-starved applications. Here, we create SNSPDs with an arced fractal geometry that almost completely eliminates this polarization dependence of the SDE, and we experimentally demonstrate 84$\pm$3$\%$ SDE, 1.02$^{+0.06}_{-0.02}$ polarization sensitivity at the wavelength of 1575 nm, and 20.8 ps timing jitter in a 0.1-W closed-cycle Gifford-McMahon cryocooler, at the base temperature of 2.0 K. This demonstration provides a novel, practical device structure of SNSPDs, allowing for operation in the visible, near-, and mid-infrared spectral ranges, and paves the way for polarization-insensitive single-photon detection with high SDE and high timing resolution
