The security of quantum key distribution (QKD) is severely threatened by discrepancies between realistic devices and theoretical assumptions. Recently, a significant framework called the reference technique was proposed to provide security against arbitrary source flaws, including pulse correlations. Here, we propose an efficient four-phase twin-field QKD using laser pulses adopting the reference technique for security against all possible source imperfections. We present a characterization of source flaws and connect them to experimental data, together with a finite-key analysis. In addition, we demonstrate the feasibility of our protocol through a proof-of-principle experimental implementation and demonstrate a secure key rate of 1.63 kbps with a 20 dB channel loss. Compared with previous QKD protocols with imperfect devices, our work considerably improves both the secure key rate and the transmission distance, and shows application potential in the practical deployment of secure QKD with device imperfections.

中文翻译：

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具有缺陷和相关源的实验双场量子密钥分布

量子密钥分发 (QKD) 的安全性受到现实设备与理论假设之间的差异的严重威胁。最近，提出了一种称为参考技术的重要框架，以提供针对任意源缺陷的安全性，包括脉冲相关性。在这里，我们提出了一种高效的四相双场 QKD，使用激光脉冲采用参考技术，以防止所有可能的源缺陷。我们提出了源缺陷的特征并将它们与实验数据联系起来，以及有限键分析。此外，我们通过原理验证实验实现证明了我们协议的可行性，并展示了 1.63 kbps 的安全密钥速率和 20 dB 的信道损耗。与以往设备不完善的 QKD 协议相比，