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arXiv 1708.04231physics.ins-detcond-mat.supr-conphysics.optics
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高效率、低噪声、4 K工作温度的UV超导纳米线单光子探测器

UV superconducting nanowire single-photon detectors with high efficiency, low noise, and 4 K operating temperature

Emma E. Wollman, Varun B. Verma, Andrew D. Beyer, Ryan M. Briggs, Francesco Marsili, Jason P. Allmaras, Adriana E. Lita, Richard P. Mirin, Sae Woo Nam, Matthew D. Shaw

摘要:

对于紫外波长的光子计数应用,目前还没有结合高效率(> 50%)、亚纳秒定时分辨率和亚Hz暗计数率的检测器。超导纳米线单光子探测器(SNSPD)在过去十年中在近红外光子计数应用方面取得了成功,但在400 nm以下波长的SNSPD优化方面却做得很少。在这里,我们描述的设计,制造和表征的UV SNSPD工作在250和370 nm之间的波长。探测器的有效面积直径可达56 $μ$ m,效率为70 - 80%,定时分辨率低至60 ps FWHM,对可见光和红外光子失明,对于直径为56 $μ$ m的像素,暗计数率约为0.25计数/小时。通过使用非晶超导体MoSi,这些UV SNSPD也能够在高达4.2K的温度下工作。这些性能指标使得紫外SNSPD非常适合应用于捕获离子量子信息处理、高层大气激光雷达研究、紫外荧光寿命成像显微镜和光子饥饿紫外天文学。

英文摘要:

For photon-counting applications at ultraviolet wavelengths, there are currently no detectors that combine high efficiency (> 50%), sub-nanosecond timing resolution, and sub-Hz dark count rates. Superconducting nanowire single-photon detectors (SNSPDs) have seen success over the past decade for photon-counting applications in the near-infrared, but little work has been done to optimize SNSPDs for wavelengths below 400 nm. Here, we describe the design, fabrication, and characterization of UV SNSPDs operating at wavelengths between 250 and 370 nm. The detectors have active areas up to 56 $μ$m in diameter, 70 - 80% efficiency, timing resolution down to 60 ps FWHM, blindness to visible and infrared photons, and dark count rates of ~ 0.25 counts/hr for a 56 $μ$m diameter pixel. By using the amorphous superconductor MoSi, these UV SNSPDs are also able to operate at temperatures up to 4.2 K. These performance metrics make UV SNSPDs ideal for applications in trapped-ion quantum information processing, lidar studies of the upper atmosphere, UV fluorescent-lifetime imaging microscopy, and photon-starved UV astronomy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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