Integrated Nonlinear Photonics for Novel Efficient Heralded Single-photon Source

这是一项物理学博士研究项目。制造技术的进步现在能够以非常低的泵浦功率在光学微结构中实现高效的非线性过程。我们的目标是在开发新的光子器件方面探索这一快速发展的研究领域。在提出的项目中，我们的目标是用一种新型的片上单光子源来推动集成量子光子学领域的发展，这种单光子源只由一个激光器和一个单波导组成。光子对的产生和预兆过程将在非线性波导内顺序发生，而不需要单独的光子分束器和光电探测器。该波导的多功能特性是基于利用光电半导体材料中的非线性相互作用，具有很强的本征二阶和三阶非线性。该装置的设计目标是在电信领域发射具有高光谱纯度的单光子，而预警过程将使用在室温或接近室温下工作的集成单光子探测器在可见光区域有效地进行。拟议的工作将包括理论和分析研究，并伴随着广泛的数值模拟。与主办机构内外的其他团体合作也是该项目的一部分，以验证理论预测。

"This is a PhD research project in Physics. Advances in fabrication technologies can now enable efficient nonlinear processes in optical microstructres with very low pump powers. Our aim is to explore this rapidly-evolving research area in developing new photonic devices. In the proposed project, we aim to advance the field of integrated quantum photonics with a novel on-chip heralded single-photon source that is just composed of a laser and a single waveguide. The generation of the photon-pairs and the heralding process will occur sequentially inside the nonlinear waveguide without the need of having a separate photon-splitter and a photodetector. The multifunction feature of the proposed waveguide is based on exploiting nonlinear interactions in optoelectronic semiconductor materials with strong intrinsic second- and third-order nonlinearities. The design of the device is aimed to emit single photons with high spectral purity in the telecom regime, while the heralding process will efficiently take place in the visible region using integrated single-photon detectors operated at, or near, room temperature. The proposed work will involve theoretical and analytical research, accompanied with extensive numerical simulations. Collaboration with other groups inside and outside the host institution is also a part of the project to demonstrate the theoretical predictions."