论文标题
露天微波量子键分布的观点
Perspectives of microwave quantum key distribution in open-air
论文作者
论文摘要
量子通信的基石之一是远程各方之间经典钥匙的无条件安全分布。量子技术的此关键特征基于传播电磁波（例如纠缠或无粘合定理）的量子特性。但是，已知这些量子资源容易受到噪声和损失的影响，在露天通信方案中无所不在。在这项工作中，我们从理论上研究了微波频率下连续变化的露天量子键分布的观点。特别是，我们提出了一个模型，描述了传播微波与嘈杂环境的耦合。使用基于位移挤压状态的协议，我们证明，具有传播微波的连续可变量子钥匙分布可以在室温下无条件安全，直至约200米。此外，我们表明，在不完美的天气条件下，微波有可能优于电信波长处的常规量子键分布。
One of the cornerstones of quantum communication is the unconditionally secure distribution of classical keys between remote parties. This key feature of quantum technology is based on the quantum properties of propagating electromagnetic waves, such as entanglement, or the no-cloning theorem. However, these quantum resources are known to be susceptible to noise and losses, which are omnipresent in open-air communication scenarios. In this work, we theoretically investigate the perspectives of continuous-variable open-air quantum key distribution at microwave frequencies. In particular, we present a model describing the coupling of propagating microwaves with a noisy environment. Using a protocol based on displaced squeezed states, we demonstrate that continuous-variable quantum key distribution with propagating microwaves can be unconditionally secure at room temperature up to distances of around 200 meters. Moreover, we show that microwaves can potentially outperform conventional quantum key distribution at telecom wavelength at imperfect weather conditions.
