全被动单片硅基量子光子电路用于纠缠光子对产生
Fully passive monolithic silicon quantum photonic circuit for entangled photon-pair generation
- Centre de Nanosciences et de Nanotechnologies, Université Paris-Saclay, CNRS（巴黎萨克雷大学国家科学研究中心纳米科学和纳米技术研究中心）
- Université Côte d’Azur, CNRS, Institut de Physique de Nice (INPHYNI)（蔚蓝海岸大学法国国家科学研究中心尼斯物理研究所）
- CEA-LETI-Minatec（法国原子能和替代能源委员会技术、电子与信息技术实验室）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究展示了一种无需主动调谐的全集成硅基量子光子对源，通过微环谐振器、布拉格滤波器和模态插分复用滤波器实现高量子性能，解决了硅基量子光子电路扩展中的关键瓶颈。
AI中文摘要：
集成量子光子电路是量子信息系统可扩展性的关键使能技术。在现有平台中，硅基光子学在紧凑尺寸内大规模集成光子组件方面提供了无与伦比的能力。然而，实现超紧凑硅器件的高折射率对比度也使其对制造缺陷高度敏感。随着电路复杂性的增加，通常需要主动调谐以维持不同组件间的光谱对准，这导致显著的功耗，最终限制了可扩展性。在此，我们展示了一种完全集成的硅基量子光子对源，其运行无需任何组件的主动调谐。该电路结合了微环谐振器中的光子对产生、使用布拉格滤波器的泵浦抑制，以及通过模态插分复用滤波器进行的信号/闲频解复用，其构建模块经过工程设计以最小化对制造变化的敏感性。所得电路实现了优异的实验量子性能。在产生的光谱范围内，符合计数率高达4000计数/秒，符合-偶然比高达100，而单独的双光子干涉测量对单独选择的ITU波长信道对产生超过93%的原始可见度。通过消除主动光谱调谐的需求同时保持高量子性能，这项工作解决了复杂硅基量子光子电路扩展中的一个主要瓶颈。
英文摘要：
Integrated quantum photonic circuits are a key enabling technology for the scalability of quantum information systems. Among the available platforms, silicon photonics offers an unrivalled capability for the large-scale integration of photonic components within compact footprints. However, the strong index contrast that enables ultra-compact silicon devices also makes them highly sensitive to fabrication imperfections. As circuit complexity increases, active tuning is generally required to maintain spectral alignment among the different components, leading to significant power consumption that ultimately limit scalability. Here, we demonstrate a fully integrated silicon quantum photon-pair source operating without active tuning of any component. The circuit combines photon-pair generation in a micro-ring resonator, pump rejection using Bragg filters, and signal/idler demultiplexing through modal add-drop filters with building blocks engineered to minimize sensitivity to fabrication variations. The resulting circuit achieves excellent experimental quantum performance. Coincidence rates up to 4000 counts s^-1 with coincidence-to-accidental ratios as high as 100 are obtained across the generated spectrum, while separate two-photon interference measurements yield raw visibilities exceeding 93% for individually selected ITU wavelength-channel pairs. By eliminating the need for active spectral tuning while maintaining high quantum performance, this work addresses a major bottleneck in the scaling of complex silicon quantum photonic circuits.
