论文标题
连续可变量子密钥分布的数字同步
Digital synchronization for continuous-variable quantum key distribution
论文作者
论文摘要
连续变量量子密钥分布（CV-QKD）是一种有希望的新兴技术，用于分布安全键进行对称加密。它可以使用商业现成的光学电信组件轻松实施。 CV-QKD接收器的关键要求是能够在正确的时间实例下测量量子状态并使用正确的正交可观察物（称为同步）对量子状态进行评分。我们为现代CV-QKD系统提出了一个数字同步程序，该系统具有本地生成的本地振荡器以进行连贯的接收。我们提出的方法是独立调制格式，允许将其用于多种CV-QKD系统。我们通过在10-20 km的标准单模式光纤中运行的高斯调制CV-QKD系统实验研究其性能。由于该过程不需要硬件修改，因此为具有成本效益的QKD解决方案铺平了道路，该解决方案可以迅速适应不断变化的环境条件。
Continuous variable quantum key distribution (CV-QKD) is a promising emerging technology for the distribution of secure keys for symmetric encryption. It can be readily implemented using commercial off-the-shelf optical telecommunications components. A key requirement of the CV-QKD receiver is the ability to measure the quantum states at the correct time instance and rate using the correct orthogonal observables, referred to as synchronization. We propose a digital synchronization procedure for a modern CV-QKD system with locally generated local oscillator for coherent reception. Our proposed method is modulation format independent allowing it to be used in a variety of CV-QKD systems. We experimentally investigate its performance with a Gaussian modulated CV-QKD system operating over a 10-20 km span of standard single mode fibre. Since the procedure does not require hardware modifications it paves the way for cost-effective QKD solutions that can adapt rapidly to changing environmental conditions.
