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arXiv 1003.0227quant-phcond-mat.supr-con
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用于量子信息和通信的超导纳米线单光子探测器

Superconducting nanowire single photon detectors for quantum information and communications

Zhen Wang, Shigehito Miki, Mikio Fujiwara

摘要:

超导纳米线单光子探测器(SNSPD或SSPD)是量子信息和通信技术领域中非常有前途的器件。我们利用超导薄膜与元件制作、光耦合封装及低温技术,发展出实用的SSPD系统。SSPD系统由六通道SSPD设备和紧凑型Gifford-McMahon(GM)制冷机组成,可以在100 V交流电源下连续运行,无需任何制冷剂。SSPD器件由在单晶MgO衬底上外延生长的高质量氮化铌(NbN)超薄膜制成。封装的SSPD器件温度稳定在2.96 K +/- 10 mK。发现面积为20 × 20 $μm^2$的SSPD器件的系统检测效率在1550和1310 nm的波长下分别为2.6%和4.5%,暗计数率为100 c/s,抖动为100 ps半峰全宽(FWHM)。我们还使用这些SSPD器件进行了超快BB84量子密钥分发(QKD)现场测试和基于纠缠的QKD实验。

英文摘要:

Superconducting nanowire single photon detectors (SNSPD or SSPD) are highly promising devices in the growing field of quantum information and communications technology. We have developed a practical SSPD system with our superconducting thin films and devices fabrication, optical coupling packaging, and cryogenic technology. The SSPD system consists of six-channel SSPD devices and a compact Gifford-McMahon (GM) cryocooler, and can operate continuously on 100 V ac power without the need for any cryogens. The SSPD devices were fabricated from high-quality niobium nitride (NbN) ultra-thin films that were epitaxially grown on single-crystal MgO substrates. The packaged SSPD devices were temperature stabilized to 2.96 K +/- 10 mK. The system detection efficiency for an SSPD device with an area of 20x20 $μm^2$ was found to be 2.6% and 4.5% at wavelengths of 1550 and 1310 nm, respectively, at a dark count rate of 100 c/s, and a jitter of 100 ps full width at half maximum (FWHM). We also performed ultra-fast BB84 quantum key distribution (QKD) field testing and entanglement-based QKD experiments using these SSPD devices.

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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