Experimental mode-pairing measurement-device-independent quantum key distribution without global phase-locking

• URL: http://arxiv.org/abs/2208.05649v1
• Date: Thu, 11 Aug 2022 05:53:08 GMT
• Title: Experimental mode-pairing measurement-device-independent quantum key distribution without global phase-locking
• Authors: Hao-Tao Zhu, Yizhi Huang, Hui Liu, Pei Zeng, Mi Zou, Yunqi Dai, Shibiao Tang, Hao Li, Lixing You, Zhen Wang, Yu-Ao Chen, Xiongfeng Ma, Teng-Yun Chen, and Jian-Wei Pan
• Abstract summary: We show a mode-pairing scheme for high-performance quantum key distribution without global phase-locking. We show a quadratic key-rate improvement over the conventional measurement-device-independent schemes. For longer distances, we also boost the key rate performance by three orders of magnitude via 304 km commercial fiber and 407 km ultra-low-loss fiber.
• Score: 8.687547048842761
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In the past two decades, quantum key distribution networks based on telecom fibers have been implemented on metropolitan and intercity scales. One of the bottlenecks lies in the exponential decay of the key rate with respect to the transmission distance. Recently proposed schemes mainly focus on achieving longer distances by creating a long-arm single-photon interferometer over two communication parties. Despite their advantageous performance over long communication distances, the requirement of phase-locking between two independent lasers is technically challenging. By adopting the recently-proposed mode-pairing idea, we realize high-performance quantum key distribution without global phase-locking. Using two independent off-the-shelf lasers, we show a quadratic key-rate improvement over the conventional measurement-device-independent schemes in the regime of metropolitan and intercity distances. For longer distances, we also boost the key rate performance by three orders of magnitude via 304 km commercial fiber and 407 km ultra-low-loss fiber. We expect this ready-to-implement high-performance scheme to be widely used in future intercity quantum communication networks.

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