On February 11, 2026, the research team spearheaded by Chang Lin from Peking University's School of Electronics, in tandem with Professor Wang Jianwei's and Professor Gong Qihuang's teams from the Institute of Modern Optics at the School of Physics, unveiled a pioneering research outcome in the esteemed international academic journal Nature. Titled “Large-Scale Quantum Communication Network Based on Integrated Photonic Quantum Chips,” this breakthrough showcased the team's successful development of fully operational, high-performance quantum key distribution chips and optical microcavity-based optical frequency comb light source chips.

Leveraging these advancements, the team constructed the world's inaugural large-scale quantum key distribution network—dubbed the “Weiming Quantum Chip Network”—rooted in integrated photonic quantum chips. This network facilitates parallel communication among 20 chip users, boasting a remarkable communication distance of up to 370 kilometers between any two users. Its networking prowess, measured by the product of client pairs logarithm and communication distance, reaches an impressive 3,700 kilometers, setting a new international benchmark in both chip user scale and networking capability.

Furthermore, the research underscored the superiority of material systems based on indium phosphide and silicon nitride in crafting photonic quantum chips, paving the way for cost-effective, large-scale production. This milestone offers a robust chip-level foundation for the future construction of practical quantum secure communication networks that span greater distances, accommodate a larger user base, and support expansive scales.