AI 中文总结
本文开发了适配混合量子光子学的超亮高可扩展KTP波导压缩光源，其具备高光子数、模式特性优异等优势，还建立了光子计数表征该光源的理论框架。
AI 中文摘要
混合量子光子学旨在结合连续变量和离散变量量子光学的互补优势，这通常需要对通过干涉多个单模压缩真空（SMSV）态产生的纠缠态进行光子计数测量。然而，由于传统光子计数方案对模式不敏感，SMSV态必须占据单一、定义明确的模式，这需要对产生该态的过程进行精心设计，以确定其空间和频谱-时间特性。此外，理想光源必须具备大规模可扩展性，能够高效产生强压缩，且与现有探测方案和光纤网络兼容。尽管已有多个平台满足上述部分要求，但同时满足所有要求仍具挑战性。本文提出一种满足所有要求的光源：针对可扩展混合量子光子架构优化的单程周期性极化II型钛氧磷酸钾（KTP）波导。该光源产生的SMSV态测得有效模式数为1.24，且亮度极高，每脉冲产生多达40000个光子，中心波长为1546nm，适配光纤网络，结合皮秒级持续时间，还能实现超导纳米线单光子探测器的固有光子数分辨。尽管该光源在简化模型中堪称理想光源，但任何光源的最终限制将由系统高增益驱动时产生的复杂动力学或态产生过程中不可避免的损耗决定，因此本文开发了一套完整的理论框架，可基于光子计数对该光源进行全面表征。
英文摘要
Hybrid quantum photonics seeks to combine the complementary advantages of continuous- and discrete-variable quantum optics. This typically entails photon-counting measurements on entangled states generated by interfering many single-mode squeezed-vacuum (SMSV) states. However, because conventional photon-counting schemes are mode-insensitive, it is critical that the SMSV states occupy a single, well-defined mode. Achieving this requires careful engineering of the process, which determines both the spatial and spectro-temporal properties of the generated state. In addition, the ideal source must be massively scalable, capable of efficiently generating strong squeezing, and remain compatible with existing detection schemes and fiber networks. Although many platforms address one or more of these requirements, satisfying all of them simultaneously remains challenging. Here, we present a source that meets all of these requirements: a single-pass, periodically poled, Type-II potassium titanyl phosphate (KTP) waveguide optimized for scalable hybrid quantum-photonic architectures. The SMSV state produced by the source has a measured effective mode number of 1.24. Furthermore, the source is extremely bright (producing up to 40 000 photons per pulse) and operates at a central wavelength of 1546nm, optimized for fiber-network compatibility and which, in combination with picosecond duration, also enables intrinsic photon-number resolution in superconducting nanowire single-photon detectors. Although this source constitutes an ideal source in a simplified picture, the ultimate limitations of any source will be governed by complex dynamics that arise when the system is driven at high-gain or due to unavoidable loss during state generation. We have therefore developed a complete theoretical framework that enables a comprehensive photon-counting-based characterization of the source.
