多载波连续变量量子密钥分发中的自适应正交检测
Adaptive Quadrature Detection for Multicarrier Continuous-Variable Quantum Key Distribution
摘要：
提出了一种用于多载波连续变量量子密钥分发（CVQKD）的自适应正交检测方法。多载波CVQKD方案使用高斯子载波连续变量进行信息传送，并使用高斯子信道进行传输。所提出的多载波检测方案动态地适应子信道条件，使用相应的统计数据，这是由我们先进的子信道估计过程。子信道估计阶段确定子信道的透射系数，该信息进一步用于自适应正交解码过程。我们定义的技术称为子载波扩频估计的子信道的透射率条件与理论误差最小的存在下的高斯噪声。我们介绍了单一和集体自适应正交检测的条款。我们还扩展了多用户多载波CVQKD方案的结果。我们证明了可实现的错误概率，信噪比，并量化的框架的属性。自适应检测方案允许利用多载波CVQKD的额外资源，并在不同的测量和传输条件下最大化可传输的有价值信息的量。该框架对于实验CVQKD场景特别方便。
英文摘要：
We propose the adaptive quadrature detection for multicarrier continuous-variable quantum key distribution (CVQKD). A multicarrier CVQKD scheme uses Gaussian subcarrier continuous variables for the information conveying and Gaussian sub-channels for the transmission. The proposed multicarrier detection scheme dynamically adapts to the sub-channel conditions using a corresponding statistics which is provided by our sophisticated sub-channel estimation procedure. The sub-channel estimation phase determines the transmittance coefficients of the sub-channels, which information are used further in the adaptive quadrature decoding process. We define the technique called subcarrier spreading to estimate the transmittance conditions of the sub-channels with a theoretical error-minimum in the presence of a Gaussian noise. We introduce the terms of single and collective adaptive quadrature detection. We also extend the results for a multiuser multicarrier CVQKD scenario. We prove the achievable error probabilities, the signal-to-noise ratios, and quantify the attributes of the framework. The adaptive detection scheme allows to utilize the extra resources of multicarrier CVQKD and to maximize the amount of transmittable valuable information in diverse measurement and transmission conditions. The framework is particularly convenient for experimental CVQKD scenarios.
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