多载波连续变量量子密钥分发的多维流形提取
Multidimensional Manifold Extraction for Multicarrier Continuous-Variable Quantum Key Distribution
摘要：
介绍了多载波连续变量（CV）量子密钥分发（QKD）中的多维流形提取方法。流形提取利用通过多载波调制的附加自由度注入到传输中的资源。我们通过AMQD（自适应多载波正交划分）方案，将信息颗粒化为高斯子载波CV，并将物理链路划分为几个高斯子信道进行传输的结果。我们证明了多载波CVQKD方案中可利用的额外自由度显着扩展了单载波CVQKD的可能性。流形提取允许各方通过利用在单载波CVQKD设置中不可用的多载波传输的那些额外资源来达到降低的错误概率。我们定义了多维流形空间的多载波CVQKD和多载波传输的自由度之间的最佳权衡。我们还扩展了多址AMQD-MQA（多用户正交分配）多载波协议的流形提取。多载波CVQKD的额外资源允许实现在实验场景中特别关键的显著性能改进。
英文摘要：
We introduce the multidimensional manifold extraction for multicarrier continuous-variable (CV) quantum key distribution (QKD). The manifold extraction utilizes the resources that are injected into the transmission by the additional degrees of freedom of the multicarrier modulation. We demonstrate the results through the AMQD (adaptive multicarrier quadrature division) scheme, which granulates the information into Gaussian subcarrier CVs and divides the physical link into several Gaussian sub-channels for the transmission. We prove that the exploitable extra degree of freedom in a multicarrier CVQKD scenario significantly extends the possibilities of single-carrier CVQKD. The manifold extraction allows for the parties to reach decreased error probabilities by utilizing those extra resources of a multicarrier transmission that are not available in a single-carrier CVQKD setting. We define the multidimensional manifold space of multicarrier CVQKD and the optimal tradeoff between the available degrees of freedom of the multicarrier transmission. We also extend the manifold extraction for the multiple-access AMQD-MQA (multiuser quadrature allocation) multicarrier protocol. The additional resources of multicarrier CVQKD allow the achievement of significant performance improvements that are particularly crucial in an experimental scenario.
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