Microcomb-driven large-scale fully connected quantum network
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.
Authors
- Guang-shu Wang
- Chang‐Ling Zou (ORCID: https://orcid.org/0000-0003-2484-7292)
- Ze-Hao Wang (ORCID: https://orcid.org/0000-0002-4229-9827)
- Zheng‐Fu Han (ORCID: https://orcid.org/0000-0002-6849-0574)
- Fang‐Xiang Wang (ORCID: https://orcid.org/0000-0003-2665-3440)
- Guo-Wei Zhang (ORCID: https://orcid.org/0000-0001-6568-9505)
- Zhen−Qiang Yin (ORCID: https://orcid.org/0000-0002-3486-3934)
- Long Huang (ORCID: https://orcid.org/0000-0001-8753-0060)
- Brent E. Little (ORCID: https://orcid.org/0000-0002-6031-4509)
- Wei Chen (ORCID: https://orcid.org/0000-0003-1789-789X)
- Shuang Wang (ORCID: https://orcid.org/0000-0003-1822-1613)
- Weiqiang Wang (ORCID: https://orcid.org/0000-0002-1157-0370)
- Guochao Wang (ORCID: https://orcid.org/0000-0002-2341-3030)
- Wenfu Zhang (ORCID: https://orcid.org/0000-0003-3208-1039)
- Wen‐Jing Ding
- Sheng‐Teng Zheng
- Lingxiao Zhu
- Guang-Can Guo
Institutions
- University of Science and Technology of China (CN)
- National University of Defense Technology (CN)
- Xi'an Institute of Optics and Precision Mechanics (CN)
- University of Chinese Academy of Sciences (CN)
- Shaanxi University of Science and Technology (CN)
Publication Details
- Journal
- Nature Communications
- Published
- 2026-08-03
- DOI
- https://doi.org/10.1038/s41467-026-75658-6
- Primary Topic
- Quantum Information and Cryptography
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- University of Science and Technology of China
- National Science and Technology Major Project