基于F-P光学微腔的光纤集成的高亮度确定性单光子源的研究

单光子是实现量子通信、光量子计算等量子信息技术不可或缺的一种光源。微腔耦合的半导体量子点单光子源因其具备产生确定性的单光子并实现单光子的定向输出等特点而备受关注。但目前高性能单光子器件在制备及光纤耦合上存在一定困难。在本项目中，我们根据自行发展的在光纤端面制备与纤芯空间位置自动对准且曲率半径精确可控的微凹镜的技术，提出构建F-P开放式微腔，采用共振啁啾脉冲激发光的全反射倏逝场来确定性激发胶体量子点，通过调节光纤位置实现微腔与量子点的耦合，并将量子点发射的单光子高效耦合到光纤中，从而制备出光纤集成的高亮度确定性单光子源的方案。本方案具有结构简单、单光子收集效率高等优点，同时适用于自组织量子点、金刚石色心、二维材料等其它单光子发射源。申请人在微腔和量子光源方向具有丰富的研究经验。本项目的顺利开展可促进高效、高集成度的单光子源的发展，对量子信息技术走向实用化具有重要意义。

Single-photon sources are building blocks for quantum information technology such as quantum communication and photonic quantum computing. Microcavity-coupled single-photon sources based on semiconductor quantum dots have attracted intense attention due to the properties of generation deterministic single photons and directional output. However, there exist difficulties in fabricating high-quality single-photon source devices and their coupling to fiber. Based on the controllable fiber-end mirror fabrication technique we developed recently which can automatically align with the fiber core, we propose a new type of fiber-integrated single-photon source based on F-P open microcavity. A resonant chirped pulse is used and evanescently excites colloidal quantum dots. By adjusting the fiber-end mirror position, a single quantum dot is coupled with the microcavity, and the emitted single photons are efficiently collected by the fiber. This method features many advantages as simple structure for easy fabrication, high output efficiency for high brightness, and may also apply to other emitters e.g. self-assembled quantum dot, diamond NV center, 2D semiconductor materials. Carrying on this project may pave a way to integrated single photon source with low cost and high efficiency, and is helpful for the development of quantum information.