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Internal cancellation of spikes using two avalanche photodiodes in series for single photon detection 下载免费PDF全文
<正>We propose a method of improving the performance of InGaAs/InP avalanche photodiodes by using two avalanche photodiodes in series as single photon detectors for 1550-nm wavelength.In this method,the raw single photon avalanche signals are not attenuated,thus a high signal-to-noise ratio can be obtained compared with the existing results.The performance of the scheme is investigated and the ratio of the dark count rate to the detection efficiency is obtained to be 1.3×10~(-4) at 213 K. 相似文献
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Decoy state quantum key distribution (QKD), being capable of beating PNS attack and being unconditionally secure has become attractive recently. However, in many QKD systems, disturbances of transmission channel make the quantum bit error rate (QBER) increase, which limits both security distance and key bit rate of real-world decoy state QKD systems. We demonstrate the two-intensity decoy QKD with a one-way Faraday- Michelson phase modulation system, which is free of channel disturbance and keeps an interference fringe visibility (99%) long period, over a 120 km single mode optical fibre in telecom (1550nm) wavelength. This is the longest distance fibre decoy state QKD system based on the two-intensity protocol. 相似文献
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文章介绍一种只用单个单光子探测器的量子真随机数发生器,装置中以3 dB光纤分束器将一个单光子脉冲分解为两个,相对延时后再合成一路由同一单光子探测器接收,由于单光子在3 dB分束器上分束的随机性,光子出现在任一路上的几率相等,将光子出现在其中一路上的定义为1,另一路定义为0,由此可得到一组只由单光子的量子分束行为决定的随机码.采用单个单光子探头,不仅可以减少装置体积,降低成本,还避免了使用双探头时,由于两个探头的基本性能和老化性能不一致所带来的问题.全光纤结构,使得装置内部的光路全封闭,装置具有抗污染和长期稳定性. 相似文献
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随着膜技术的发展,在汽车贴膜上的应用也越来越多,在生活中发现的奇特现象也越来越多[1],在本文中,根据发现“透过车窗玻璃膜观察路灯时会出现一条超长的亮线”这一现象,进行机理上的初步探究。本文先进行初步分析:运用光学知识分析以及Matlab仿真分析推断可能的结构与机理——在光源到人眼这一光路中一定存在某一超细的细缝(丝)或光栅结构,接着实验验证了相关光学理论,并相继观察了别的光源,判断出是由于汽车膜中的特殊光栅结构导致的“超长亮线”这一现象,接着搜寻相关资料去找出汽车膜中这一特殊的结构,得出结论。 相似文献
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