Resource-efficient quantum key distribution with integrated silicon photonics

• URL: http://arxiv.org/abs/2212.12980v2
• Date: Sun, 11 Jun 2023 02:22:41 GMT
• Title: Resource-efficient quantum key distribution with integrated silicon photonics
• Authors: Kejin Wei, Xiao Hu, Yongqiang Du, Xin Hua, Zhengeng Zhao, Ye Chen, Chunfeng Huang, and Xi Xiao
• Abstract summary: Integrated photonics provides a promising platform for quantum key distribution (QKD) system in terms of miniaturization, robustness and scalability. Here, we report a demonstration of resource-efficient chip-based BB84 QKD with a silicon-based encoder and decoder.
• Score: 9.319767987871627
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Integrated photonics provides a promising platform for quantum key distribution (QKD) system in terms of miniaturization, robustness and scalability. Tremendous QKD works based on integrated photonics have been reported. Nonetheless, most current chip-based QKD implementations require additional off-chip hardware to demodulate quantum states or perform auxiliary tasks such as time synchronization and polarization basis tracking. Here, we report a demonstration of resource-efficient chip-based BB84 QKD with a silicon-based encoder and decoder. In our scheme, the time synchronization and polarization compensation are implemented relying on the preparation and measurement of the quantum states generated by on-chip devices, thus no need additional hardware. The experimental tests show that our scheme is highly stable with a low intrinsic QBER of $0.50\pm 0.02\%$ in a 6-h continuous run. Furthermore, over a commercial fiber channel up to 150 km, the system enables realizing secure key distribution at a rate of 866 bps. Our demonstration paves the way for low-cost, wafer-scale manufactured QKD system.

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