On February 12, Peking University's School of Physics official WeChat account announced a significant breakthrough. The research team, led by Professor Wang Jianwei and Professor Gong Qihuang from the Institute of Modern Optics, in collaboration with Researcher Chang Lin from the School of Electronics, published their findings in Nature. Their study, titled "Large-Scale Quantum Communication Network Based on Integrated Photonic Quantum Chips," showcases the successful development of fully functional, high-performance quantum key distribution chips and optical microcavity optical frequency comb light source chips.

Using these innovations, the team constructed the world's first large-scale quantum key distribution network based on integrated photonic quantum chips, dubbed the "Weiming Quantum Chip Network." This network facilitates parallel communication among 20 chip users, with a maximum communication distance of 370 kilometers between any two users and a networking capability extending up to 3,700 kilometers. These achievements place the network at the international forefront in terms of both the scale of chip users and networking capability.

Additionally, the research validated the superiority of material systems based on indium phosphide and silicon nitride for manufacturing photonic quantum chips, establishing a technological foundation for cost-effective, large-scale production. This breakthrough offers a robust chip-level solution for the future development of practical quantum secure communication networks.