Twin-field quantum key distribution without optical frequency dissemination

• URL: http://arxiv.org/abs/2208.09347v2
• Date: Fri, 31 Mar 2023 11:58:08 GMT
• Title: Twin-field quantum key distribution without optical frequency dissemination
• Authors: Lai Zhou, Jinping Lin, Yumang Jing and Zhiliang Yuan
• Abstract summary: We introduce a novel technique that can stabilise an open channel without using a closed interferometer. We develop a simple and versatile TF-QKD setup that does not need service fibre and can operate over links of 100 km asymmetry. We confirm the setup's repeater-like behaviour and obtain a finite-size rate of 0.32 bit/s at a distance of 615.6 km.
• Score: 0.35557219875516644
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Twin-field (TF) quantum key distribution (QKD) has rapidly risen as the most viable solution to long-distance secure fibre communication thanks to its fundamentally repeater-like rate-loss scaling. However, its implementation complexity, if not successfully addressed, could impede or even prevent its advance into real-world. To satisfy its requirement for twin-field coherence, all present setups adopted essentially a gigantic, resource-inefficient interferometer structure that lacks scalability that mature QKD systems provide with simplex quantum links. Here we introduce a novel technique that can stabilise an open channel without using a closed interferometer and has general applicability to phase-sensitive quantum communications. Using locally generated frequency combs to establish mutual coherence, we develop a simple and versatile TF-QKD setup that does not need service fibre and can operate over links of 100 km asymmetry. We confirm the setup's repeater-like behaviour and obtain a finite-size rate of 0.32 bit/s at a distance of 615.6 km.

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