High-Dimensional Remote State Preparation with Metasurface-Based Hyper-Entangled Photon Source

A high-dimensional quantum network with multiple degrees of freedom provides enhanced channel capacity and noise resilience, making it highly significant for quantum communication. However, achieving quantum networks with high-dimensional hyper-entanglements using traditional optical systems presents substantial challenges. In this study, the generation of a compact high-dimensional hyper-entangled photon source utilizing a metasurface is demonstrated. Furthermore, a scalable protocol for the remote preparation of high-dimensional single-photon states, ranging from 3 to 8 dimensions based on this entangled light source is theoretically proposed and experimentally validated. The average fidelities of the remotely prepared states all exceed 0.9. This metasurface-based approach to quantum communication protocols presents a promising avenue for the development of large-scale quantum networks and distributed quantum computing systems.