Entanglement is a counterintuitive feature of quantum physics that is at the heart of quantum technology. High-dimensional quantum states offer unique advantages in various quantum information tasks. Integrated photonic chips have recently emerged as a leading platform for the generation, manipulation and detection of entangled photons. Here, we report a silicon photonic chip that uses interferometric resonance-enhanced photon-pair sources, spectral demultiplexers and high-dimensional reconfigurable circuitries to generate, manipulate and analyse path-entangled three-dimensional qutrit states. By minimizing on-chip electrical and thermal cross-talk, we obtain high-quality quantum interference with visibilities above 96.5% and a maximally entangled-qutrit state with a fidelity of 95.5%. We further explore the fundamental properties of entangled qutrits to test quantum nonlocality and contextuality, and to implement quantum simulations of graphs and high-precision optical phase measurements. Our work paves the path for the development of multiphoton high-dimensional quantum technologies.

纠缠是量子物理学的反常理，它是量子技术的核心。高维量子态在各种量子信息任务中具有独特的优势。集成光子芯片最近已成为纠缠光子的生成，操纵和检测的领先平台。在这里，我们报告了一种硅光子芯片，该芯片使用干涉共振增强的光子对源，光谱解复用器和高维可重配置电路来生成，操纵和分析路径纠缠的三维量子态。通过最小化芯片上的电和热串扰，我们获得了可见性高于96.5％的高质量量子干涉，保真度达到95.5％的最大纠缠四态。我们进一步探索纠缠态量子态的基本性质，以测试量子非局部性和上下文性，并实现图的量子模拟和高精度光学相位测量。我们的工作为多光子高维量子技术的发展铺平了道路。