High-rate quantum key distribution with compact state preparation and detection

• 成果类型: Article
• 署名作者: Fan-Yuan, Guan-Jie; Xie, Wei-Xin; He, De-Yong; Huang, Xiao-Juan; Wang, Shuang; Yin, Zhen-Qiang; Chen, Wei; Li, Qiong; Mao, Hao-Kun; Zhang, Guo-Wei; Wang, Yu-Long; Guo, Guang-Can; Han, Zheng-Fu
• 署名单位: Chinese Academy of Sciences; University of Science & Technology of China, CAS; CAS Center for Excellence in Quantum Information & Quantum Physics; Chinese Academy of Sciences; University of Science & Technology of China, CAS; CAS Center for Excellence in Quantum Information & Quantum Physics; Hefei National Laboratory; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Harbin Institute of Technology
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.2521590123
• 发表日期: 2026-05-05
• 页码: e2521590123
• 关键词: quantum key distribution; single-photon detector; integrated optics; quantum information; quantum optics

摘要

Quantum key distribution (QKD) is a promising technology for information-theoretic secure communications. The practicality of QKD systems is critical for large-scale network deployment, requiring both high key generation rate and miniaturized modules for quantum-state preparation and detection. Here, we report a deployable QKD system that achieves secure key rates of 60.33 +/- 0.03 Mbps at 10 km and 3.08 +/- 0.20 Mbps at 100 km. The system integrates a dual-parallel Mach-Zehnder encoder to achieve high-fidelity, unified preparation of polarization and decoy states via single-step modulation in a compact design. Meanwhile, we developed miniaturized single-photon avalanche detectors operating at 2.5 GHz, achieving high count rates while maintaining low noise. This high-performance and compact solution establishes a feasible roadmap for urban secure communication networks that require high capacity and bandwidth.