20181211第36期博士沙龙学术报告信息

主办：物理学科基础课实验教学示范中心

时间：2018年12月11日（星期二）上午 10:00
地点：理6-220

报告人：顾敏

题目： 超导纳米线单光子探测器研究与应用


内容摘要：

超导纳米线单光子探测器（SNSPD）是一种最新的单光子检测技术，它具有高效、快速、准确地探测单光子，同时暗计数低、响应频谱宽等特点，是当前单光子探测技术研究领域中的热门研究方向。经过近年来的发展，SNSPD 表现出比其他现有单光子探测器更优异的性能。在探测效率方面使用NbN材料制备的SNSPD，其在1550 nm波段的系统探测效率已经达到80%以上，而暗计数却只有100 Hz。NbN SNSPD的时间抖动也能够达到10 ps以下，重复速率超过100 MHz。基于WSi材料的SNSPD的系统探测效率更是超过90%。由于超导纳米线单光子探测器非常突出的性能，近两年来，它被广泛应用于量子保密通讯、集成电路检测、生物荧光成像、量子雷达、深空通信等领域。

Abstract：

Superconducting nanowire single-photon detector (SNSPD) is a latest single photon detection, which has high system

detector efficiency (SDE), low dark counts rate (DCR), high repetition rate and wide response spectrum. It is the hottest
research area in recent years. With these years of fast development, the SNSPDs produced recently show great properties than the other existing single photon detectors. The SDE of SNSPD based on niobium nitride (NbN) thin film is over 80%, when the dark count rate is 100 Hz. The timing jitter is less than 10 ps and the maximum count rate is over 100 MHz for SNSPD based on NbN thin film. The SDE of SNSPD based on WSi thin film is more than 90%. Due to the excellent properties, SNSPDs are widely applied in quantum key distribution, integrated circuit testing, biomedical fluorescent imaging, quantum radar, deep space communication and so on.



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