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Resource-efficient quantum key distribution with integrated silicon photonics

Kejin WeiXiao HuYongqiang Du ...+4 Xi Xiao
Dec 2022
摘要
Integrated photonics provides a promising platform for quantum keydistribution (QKD) system in terms of miniaturization, robustness andscalability. Tremendous QKD works based on integrated photonics have beenreported. Nonetheless, most current chip-based QKD implementations requireadditional off-chip hardware to demodulate quantum states or perform auxiliarytasks such as time synchronization and polarization basis tracking. Here, wereport a demonstration of resource-efficient chip-based BB84 QKD with asilicon-based encoder and decoder. In our scheme, the time synchronization andpolarization compensation are implemented relying on the preparation andmeasurement of the quantum states generated by on-chip devices, thus no needadditional hardware. The experimental tests show that our scheme is highlystable 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 enablesrealizing secure key distribution at a rate of 866 bps. Our demonstration pavesthe way for low-cost, wafer-scale manufactured QKD system.
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