arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1504.04713physics.opticscond-mat.supr-conphysics.ins-det
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超导纳米线单光子探测器在光照下的暗计数

Dark counts of superconducting nanowire single-photon detector under illumination

Sijing Chen, Lixing You, Weijun Zhang, Xiaoyan Yang, Hao Li, Lu Zhang, Zhen Wang, Xiaoming Xie

摘要:

超导纳米线单光子探测器(SNSPD)在偏置电流(Ib)接近开关电流(Isw)的情况下,探测器的探测效率会出现异常的增加.通过引入时间相关单光子计数技术,我们研究了光照下SNSPD探测计数的时间直方图。时间信息帮助我们在时域中区分光子计数和暗计数。以这种方式,可以确定照明下的暗计数率(DCR)和精确的亮度。在中等照明下的DCR可能显著大于在高Ib下没有照明下测量的常规DCR,这导致了在λ中的异常增加。增加的DCR可以通过在光照下抑制Isw来解释。

英文摘要:

An abnormal increase in the SDE was observed for superconducting nanowire single-photon detectors (SNSPDs) when the bias current (Ib) was close to the switching current (Isw). By introducing the time-correlated single-photon counting technique, we investigated the temporal histogram of the detection counts of an SNSPD under illumination. The temporal information helps us to distinguish photon counts from dark counts in the time domain. In this manner, the dark count rate (DCR) under illumination and the accurate SDE can be determined. The DCR under moderate illumination may be significantly larger than the conventional DCR measured without illumination under a high Ib, which causes the abnormal increase in the SDE. The increased DCR may be explained by the suppression of Isw under illumination.

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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