Field Test of Twin-Field Quantum Key Distribution through Sending-or-Not-Sending over 428 km

• URL: http://arxiv.org/abs/2101.00276v1
• Date: Fri, 1 Jan 2021 17:35:59 GMT
• Title: Field Test of Twin-Field Quantum Key Distribution through Sending-or-Not-Sending over 428 km
• Authors: Hui Liu, Cong Jiang, Hao-Tao Zhu, Mi Zou, Zong-Wen Yu, Xiao-Long Hu, Hai Xu, Shizhao Ma, Zhiyong Han, Jiu-Peng Chen, Yunqi Dai, Shi-Biao Tang, Weijun Zhang, Hao Li, Lixing You, Zhen Wang, Fei Zhou, Qiang Zhang, Xiang-Bin Wang, Teng-Yun Chen, and Jian-Wei Pan
• Abstract summary: Twin-field quantum key distribution (TF-QKD) has attracted considerable attention because of its outstanding key rates over long distances. Here, we demonstrate a field-test QKD over 428km deployed commercial fiber and two users are physically separated by about 300km in a straight line. We achieve a new distance record for the field test of both TF-QKD and all types of fiber-based QKD systems.
• Score: 15.390492764316264
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum key distribution endows people with information-theoretical security in communications. Twin-field quantum key distribution (TF-QKD) has attracted considerable attention because of its outstanding key rates over long distances. Recently, several demonstrations of TF-QKD have been realized. Nevertheless, those experiments are implemented in the laboratory, remaining a critical question about whether the TF-QKD is feasible in real-world circumstances. Here, by adopting the sending-or-not-sending twin-field QKD (SNS-TF-QKD) with the method of actively odd parity pairing (AOPP), we demonstrate a field-test QKD over 428~km deployed commercial fiber and two users are physically separated by about 300~km in a straight line. To this end, we explicitly measure the relevant properties of the deployed fiber and develop a carefully designed system with high stability. The secure key rate we achieved breaks the absolute key rate limit of repeater-less QKD. The result provides a new distance record for the field test of both TF-QKD and all types of fiber-based QKD systems. Our work bridges the gap of QKD between laboratory demonstrations and practical applications, and paves the way for intercity QKD network with high-speed and measurement-device-independent security.

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