论文标题
具有任意调制协议的基于OFDM的多载体连续变量量子键分布的性能分析
Performance analysis for OFDM-based multi-carrier continuous-variable quantum key distribution with arbitrary modulation protocol
论文作者
论文摘要
多载波连续变量可变量子密钥分布（CV-QKD）被认为是提高秘密密钥速率（SKR）比现有的单载波CV-QKD方案的有前途的方法。但是，在不完美的多载体量子态制备过程中引起的额外多余噪声将限制系统的性能。在这里，基于正交频施加多路复用（OFDM）的多载体CV-QKD提出了系统的调制噪声模型。随后，可以通过组合单载波CV-QKD的安全分析方法来定量评估多载体CV-QKD具有任意调制协议（例如QPSK，256QAM和Gaussian调制协议）的性能。在实用的系统参数下，模拟结果表明，即使使用不完美的实际调制，也可以通过增加载体数n来显着改善多载体CV-QKD的SKR。具体而言，可以通过仔细选择n来优化多载体CV-QKD的总SKR。所提出的模型为未来的多携带者CV-QKD实验实现提供了可行的理论框架。
Multi-carrier continuous-variable quantum key distribution (CV-QKD) is considered to be a promising way to boost the secret key rate (SKR) over the existing single-carrier CV-QKD scheme. However, the extra excess noise induced in the imperfect multi-carrier quantum state preparation process of N subcarriers will limit the performance of the system. Here, a systematic modulation noise model is proposed for the multi-carrier CV-QKD based on the orthogonal frequency division multiplexing (OFDM). Subsequently, the performance of multi-carrier CV-QKD with arbitrary modulation protocol (e.g. QPSK, 256QAM and Gaussian modulation protocol) can be quantitatively evaluated by combining the security analysis method of the single-carrier CV-QKD. Under practical system parameters, the simulation results show that the SKR of the multi-carrier CV-QKD can still be significantly improved by increasing the carrier number N even with imperfect practical modulations. Specifically, the total SKR of multi-carrier CV-QKD can be optimized by carefully choosing N. The proposed model provides a feasible theoretical framework for the future multi-carrier CV-QKD experimental implementation.
