Twin-field quantum key distribution with local frequency reference

• URL: http://arxiv.org/abs/2310.18292v1
• Date: Fri, 27 Oct 2023 17:29:52 GMT
• Title: Twin-field quantum key distribution with local frequency reference
• Authors: Jiu-Peng Chen and Fei Zhou and Chi Zhang and Cong Jiang and Fa-Xi Chen and Jia Huang and Hao Li and Li-Xing You and Xiang-Bin Wang and Yang Liu and Qiang Zhang and Jian-Wei Pan
• Abstract summary: We propose and demonstrate a simple and practical approach to realize TF-QKD without requiring relative frequency control of the independent laser sources. We experimentally demonstrate the TF-QKD over 502 km, 301 km and 201 km ultra-low loss optical fiber respectively. We expect this high-performance scheme will find widespread usage in future intercity and free-space quantum communication networks.
• Score: 18.04679036242816
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Twin-field quantum key distribution (TF-QKD) overcomes the linear rate-loss limit, which promises a boost of secure key rate over long distance. However, the complexity of eliminating the frequency differences between the independent laser sources hinders its practical application. Here, taking the saturated absorption spectroscopy of acetylene as an absolute reference, we propose and demonstrate a simple and practical approach to realize TF-QKD without requiring relative frequency control of the independent laser sources. Adopting the 4-intensity sending-or-not-sending TF-QKD protocol, we experimentally demonstrate the TF-QKD over 502 km, 301 km and 201 km ultra-low loss optical fiber respectively. We expect this high-performance scheme will find widespread usage in future intercity and free-space quantum communication networks.

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