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首页> 外文期刊>Physical Review X >Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection
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Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

机译：基于相干检测的连续变量量子密钥分布“本地”生成本地振荡器

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Continuous-variable quantum key distribution (CV-QKD) protocols based on coherent detection have been studied extensively in both theory and experiment. In all the existing implementations of CV-QKD, both the quantum signal and the local oscillator (LO) are generated from the same laser and propagate through the insecure quantum channel. This arrangement may open security loopholes and limit the potential applications of CV-QKD. In this paper, we propose and demonstrate a pilot-aided feedforward data recovery scheme that enables reliable coherent detection using a “locally” generated LO. Using two independent commercial laser sources and a spool of 25-km optical fiber, we construct a coherent communication system. The variance of the phase noise introduced by the proposed scheme is measured to be 0.04 ( rad 2 ), which is small enough to enable secure key distribution. This technology also opens the door for other quantum communication protocols, such as the recently proposed measurement-device-independent CV-QKD, where independent light sources are employed by different users.
机译：基于相干检测的连续变量量子密钥分发（CV-QKD）协议已在理论和实验中得到了广泛的研究。在CV-QKD的所有现有实现中，量子信号和本地振荡器（LO）都是从同一激光器产生的，并通过不安全的量子通道传播。这种安排可能会打开安全漏洞，并限制CV-QKD的潜在应用。在本文中，我们提出并演示了一种飞行员辅助前馈数据恢复方案，该方案能够使用“本地”生成的LO进行可靠的相干检测。我们使用两个独立的商用激光源和一个25公里的线轴，构建了一个相干的通信系统。由所提出的方案引入的相位噪声的变化被测量为0.04（rad 2），该变化足够小以使得能够进行安全的密钥分配。这项技术还为其他量子通信协议打开了大门，例如最近提出的独立于测量设备的CV-QKD，其中不同用户采用独立光源。

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