A local local oscillator passive continuous variable quantum key distribution scheme with trusted phase noise model and optical amplifiers

IF 2.2 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-04-03 DOI:10.1016/j.optcom.2025.131796

Xiaodong Wu , Duan Huang

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引用次数: 0

Abstract

Local local oscillator (LLO) passive continuous variable (CV) quantum key distribution (QKD) scheme can simplify the implementation of the LLO scheme and make it more cost-effective. Nevertheless, in practice, since the imperfect device employed, such as imperfect lasers and detectors, traditional LLO passive CVQKD system still exists relatively large residual phase noise. Based on this, we propose a LLO passive CVQKD scheme with a trusted phase noise (TPN) model, which considers part of partial phase reference measurement noise and phase-reference light intensity real-time monitored by receiver as trusted. The reason is that the receiver can perform local calibration for it. Results illustrate that the LLO passive CV-QKD using TPN model can effectively enhance its performance compared with that of traditional LLO passive CV-QKD. Besides, we apply phase-insensitive amplifier to realize Bob’s detector imperfection compensation and achieve further secret key rate improvement over long distances by setting a suitable amplification gain.

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一种具有可信相位噪声模型和光学放大器的局部本振无源连续可变量子密钥分配方案

本振（LLO）无源连续变量（CV）量子密钥分发（QKD）方案可以简化本振（LLO）方案的实现，使其更具成本效益。然而，在实际应用中，由于采用了不完善的器件，如不完善的激光器和探测器，传统的低电平无源CVQKD系统仍然存在较大的剩余相位噪声。在此基础上，提出了一种基于可信相位噪声（TPN）模型的LLO无源CVQKD方案，该方案将接收机实时监测的部分相位参考测量噪声和相位参考光强视为可信的。原因是接收机可以对其进行本地校准。结果表明，与传统的LLO无源CV-QKD相比，采用TPN模型的LLO无源CV-QKD能有效提高其性能。此外，我们采用相不敏感放大器来实现鲍勃探测器缺陷补偿，并通过设置适当的放大增益来进一步提高长距离密钥速率。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.