Microcomb-driven large-scale fully connected quantum network
Abstract
Abstract Fully connected quantum networks enable simultaneous connection of every user to every other user and are a highly versatile and robust networking architecture. However, the scalability of such networks remains a great challenge for practical applications. Here we construct a large-scale fully connected quantum network founded on two-photon Hong-Ou-Mandel (HOM) interference, where user-to-user security is guaranteed even with an untrusted network provider. Using integrated soliton microcomb (SMC) and photonic encoding chips, we realize precise, massively parallel frequency generation and locking, high-visibility HOM interference and measurement-device-independent (MDI) quantum key distribution. The proposed architecture enables a fully connected quantum network over 200 kilometers with strict information-theoretic security via an untrusted network provider. The implemented networking architecture paves the way for large-scale fully connected MDI quantum networks across metropolitan and intercity regions.
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Authors: Fang‐Xiang Wang, Sheng‐Teng Zheng, Long Huang, Guo-Wei Zhang, Guang-shu Wang, Wen‐Jing Ding, Ze-Hao Wang, Shuang Wang, Zhen−Qiang Yin, Chang‐Ling Zou, Brent E. Little, Guochao Wang, Lingxiao Zhu, Guang-Can Guo, Weiqiang Wang, Wenfu Zhang, Wei Chen, Zheng‐Fu Han
Institutions: University of Chinese Academy of Sciences, Shaanxi University of Science and Technology, University of Science and Technology of China, National University of Defense Technology, Xi'an Institute of Optics and Precision Mechanics