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Reference‐Frame‐Independent Mode‐Pairing Quantum Key Distribution with Advantage Distillation

Advanced Quantum Technologies(2024)

Beijing Univ Posts & Telecommun

Cited 0|Views15
Abstract
The coordination between distance and the secure key rate is one of the main challenges in the practical application of quantum key distribution (QKD). Mode-pairing quantum key distribution is one of the schemes that can surpass the secret key capacity for repeaterless QKD. However, the protocol utilizes phase to encode the information, which leads to the problem of active stabilization in the interferometer. In this paper, a reference-frame-independent mode-pairing quantum key distribution (RFI-MP-QKD) is proposed as an effective scheme to solve this problem. Moreover, the performance of the RFI-MP-QKD protocol is improved by applying the Advantage Distillation (AD) method in data post-processing, which separates the highly correlated raw key bits from the weakly correlated information. The simulation results show that the secure key rate of RFI-MP-QKD has almost no degradation for reference frame deviation angles of 0 degrees similar to 7 degrees. Compared to RFI-MP-QKD without AD method, the AD method decreases the quantum bit error rate from 0.04 to 0.012 and increases the maximum transmission distance from 406 to 450 km. The scheme proposed is expected to facilitate the practical implementation of RFI-MP-QKD, especially in cases of concerning reference frame alignment and high channel loss.
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Key words
advantage distillation,mode-pairing,quantum key distribution,reference-frame-independent
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要点】:论文提出了一种参考帧无关的模式配对量子密钥分发方案(RFI-MP-QKD),并结合优势提炼(AD)方法提高了性能,实现了在参考帧偏移角度接近7度时密钥率几乎没有退化,显著增加了最大传输距离。

方法】:通过采用参考帧无关的设计和优势提炼的数据后处理方法,优化了模式配对量子密钥分发的性能。

实验】:通过模拟实验,使用优势提炼方法将量子比特错误率从0.04降低至0.012,并将最大传输距离从406公里增加至450公里,验证了RFI-MP-QKD方案的有效性。论文未具体提及所使用的数据集名称。