Description of the project. Efficient Chip-Integrated Photon Counting Detectors

项目描述。

• 批准号: 1979571
• 金额: --
• 依托单位: University of Bristol
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-1979571
• 关键词: Description; project.; Efficient; Chip; Integrated

We propose a new type of photodector based on multiplexed chip-integrated evanescently coupled superconducting films. This approach can achieve single-photon resolution up to hundreds of photons- a hundred-fold improvement over current devices. Our team developed evanescently coupled photon counting detectors in an EPSRC-funded collaboration with the groups of Peter Smith (ORC, Southampton) and Sae Woo Nam (NIST Boulder).The concept is that silica-on-silicon waveguides are fabricated sufficiently close to the chip surface so that thin metal films deposited on the surface absorb the evanescent field of the guided mode. Here, we leverage a unique aspect of this detector design: light that is not absorbed by a detector remains in the guided mode. The evanescent coupling therefore enables an efficient, highly scalable scheme that chains together a series of many detection elements. We will develop devices with two types of elements that provide complementary performance in timing and number resolution: transition edge sensors (TESs) and superconducting nanowire single-photon detectors (SNSPDs). In isolation, these elements are saturated with one (SNSPD) or a few (TES) photons. Effective multiplexing avoids element saturation while detecting many excitations in sum.This project aims to deliver the first multiplexed detector with single-photon resolution extending over a hundred photons. The work will include device modelling, characterisation by quantum detector tomography, and a theoretical study on the limits of multiplexed detectors. The student will also work alongside NQIT photonics researchers to progress application in photonic quantum simulators and an entanglement-based quantum random number generator (QRNG)

提出了一种基于多路复用片集成渐变耦合超导薄膜的新型光电探测器。这种方法可以实现高达数百个光子的单光子分辨率--比目前的设备提高了100倍。我们的团队与Peter Smith(ORC，Southampton)和Sae Woo South(NIST Boulder)团队合作，在EPSRC的资助下开发了渐变耦合光子计数探测器。其概念是，硅基硅光波导被制造得足够靠近芯片表面，以便沉积在表面的薄金属薄膜吸收导模的逝去场。在这里，我们利用这种探测器设计的一个独特方面：未被探测器吸收的光保持在引导模式中。因此，消逝耦合使得能够将一系列许多检测元件链接在一起的高效、高度可扩展的方案。我们将开发两种类型的器件，它们在时间和数字分辨率方面提供互补的性能：跃迁边缘传感器(TESS)和超导纳米线单光子探测器(SNSPD)。孤立地，这些元素被一个(SNSPD)或几个(TES)光子饱和。有效的多路复用避免了元素饱和，同时同时检测到多个激励。该项目的目标是提供第一个单光子分辨率超过100个光子的多路复用探测器。这项工作将包括器件建模、量子探测器层析成像表征，以及对多路复用探测器极限的理论研究。这名学生还将与NQIT光子学研究人员合作，推动光子量子模拟器和基于纠缠的量子随机数生成器(QRNG)的应用