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正交频分复用技术已被广泛应用于量子密钥分发系统研究中,在此提出了基于正交频分复用的连续变量量子密钥分发方案,连续变量量子密钥分发过程中发送方以快速傅立叶反变换调制复用子载波,接收方以快速傅立叶变换得到原始频域子载波,并由系统协方差矩阵性能刻画出传输性能。仿真结果显示:正交频分复用技术能够提高连续变量量子密钥分发系统的传输密钥率。
Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in quantum key distribution system. In this paper, a continuous variable quantum key distribution scheme based on Orthogonal Frequency Division Multiplexing (OFDM) is proposed. In the process of continuous variable quantum key distribution, The subcarriers are modulated with an inverse fast Fourier transform. The receiver obtains the original frequency domain subcarriers by fast Fourier transform, and the transmission performance is characterized by the system covariance matrix. Simulation results show that Orthogonal Frequency Division Multiplexing (OFDM) can improve the transmission key rate of continuous variable quantum key distribution system.