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arXiv 2109.04722quant-ph
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基于本振子的连续变量量子密钥分发的相位噪声模型

Phase Noise Model for Continuous-Variable Quantum Key Distribution Using a Local Local Oscillator

Yun Shao, Heng Wang, Yaodi Pi, Wei Huang, Yang Li, Jinlu Liu, Jie Yang, Yichen Zhang, Bingjie Xu

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25 pages, 5 figures
发表信息：
Physical Review A, 104(3): 032608 (2021)
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摘要：

相位补偿后的剩余相位噪声是限制连续变量量子密钥分发（LLO CV-QKD）系统性能提高的主要因素之一。然而，由于实际应用中所采用的器件的非理想性，如激光器、探测器、非平衡干涉仪等，使得现有系统中的残余相位噪声仍然较大。在这里，我们开发了一个相位噪声模型，以提高相位噪声容限的LLO CV-QKD计划。在我们的模型中，与Bob的检测器的检测效率和电子噪声相关联的相位参考测量噪声的一部分以及Bob侧的实时监测的相位参考强度被认为是可信的，因为它可以由Bob本地校准。我们表明，使用我们的相位噪声模型可以显着提高安全的密钥速率和传输距离的LLO CV-QKD系统。我们进一步进行了实验，以证实相位噪声模型的优越性。基于LLO CV-QKD系统在25 km光纤信道上的实验数据，我们证明了在我们的相位噪声模型下的安全密钥速率比在传统相位噪声模型下的安全密钥速率高约40%。

英文摘要：

The value of residual phase noise, after phase compensation, is one of the key limitations of performance improvement for continuous-variable quantum key distribution using a local local oscillator (LLO CV-QKD) system, since it is the major excess noise. However, due to the non-ideality of the realistic devices implemented in practice, for example, imperfect lasers, detectors and unbalanced interferometers, the value of residual phase noise in current system is still relatively large. Here, we develop a phase noise model to improve the phase noise tolerance of the LLO CV-QKD schemes. In our model, part of the phase-reference measurement noise associated with detection efficiency and electronic noise of Bob's detector as well as a real-time monitored phasereference intensity at Bob's side is considered trusted because it can be locally calibrated by Bob. We show that using our phase noise model can significantly improve the secure key rate and transmission distance of the LLO CV-QKD system. We further conduct an experiment to substantiate the superiority of the phase noise model. Based on experimental data of a LLO CV-QKD system in the 25 km optical fiber channel, we demonstrate that the secure key rate under our phase noise model is approximately 40% higher than that under the conventional phase noise model.

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