Unidimensional continuous-variable quantum key distribution (CV-QKD) protocol with Gaussian modulation is simpler in implementation and lower in costs than its two-dimensional counterpart, but its secure transmission distance is not as far as the latter. In this paper, we give a solution that using the photon subtraction, which is one of non-Gaussian operations, to improve the performance of the unidimensional CV-QKD protocol. Security analysis and numerical simulation indicate that the photon subtraction operation can significantly improve the secure transmission distance of the unidimensional CV-QKD protocol.

中文翻译：

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用虚拟光子减法增强一维连续可变量子密钥分布

具有高斯调制的一维连续变量量子密钥分配（CV-QKD）协议比二维协议实现更简单，成本更低，但其安全传输距离不如后者。在本文中，我们给出了一种解决方案，即使用光子减法（非高斯运算之一）来提高一维 CV-QKD 协议的性能。安全分析和数值模拟表明，光子减法操作可以显着提高一维CV-QKD协议的安全传输距离。