多载波连续变量量子密钥分发的子载波域
Subcarrier Domain of Multicarrier Continuous-Variable Quantum Key Distribution
摘要：
提出了多载波连续变量量子密钥分发（QKD）的子载波域。在多载波CVQKD方案中，信息被粒度化为高斯子载波CV，并且物理高斯链路被划分为高斯子信道。子信道专用于子载波CV的传送。角域利用高斯子载波CV的相空间角来构造高斯子信道的物理模型。子载波域将物理属性注入子载波传输的描述。我们证明了在多载波CVQKD方案中，子载波域是子载波级传输的自然表示。我们还将子载波域扩展到多址多载波CVQKD设置。我们通过自适应多载波正交划分（AMQD）CVQKD方案和AMQD-MQA（多用户正交分配）多址多载波方案证明了结果。子载波域表示提供了可以用于任意多载波CVQKD场景的一般装置。该框架是特别方便的实验多载波CVQKD方案。
英文摘要：
We propose the subcarrier domain of multicarrier continuous-variable (CV) quantum key distribution (QKD). In a multicarrier CVQKD scheme, the information is granulated into Gaussian subcarrier CVs and the physical Gaussian link is divided into Gaussian sub-channels. The sub-channels are dedicated for the conveying of the subcarrier CVs. The angular domain utilizes the phase-space angles of the Gaussian subcarrier CVs to construct the physical model of a Gaussian sub-channel. The subcarrier domain injects physical attributes to the description of the subcarrier transmission. We prove that the subcarrier domain is a natural representation of the subcarrier-level transmission in a multicarrier CVQKD scheme. We also extend the subcarrier domain to a multiple-access multicarrier CVQKD setting. We demonstrate the results through the adaptive multicarrier quadrature-division (AMQD) CVQKD scheme and the AMQD-MQA (multiuser quadrature allocation) multiple-access multicarrier scheme. The subcarrier domain representation provides a general apparatus that can be utilized for an arbitrary multicarrier CVQKD scenario. The framework is particularly convenient for experimental multicarrier CVQKD scenarios.
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