PSK量子噪声随机加密系统的实现方法研究

Realization method of PSK quantum-noise randomized cipher system

量子噪声随机加密(QNRC)是一种基于海森堡不确定性原理的物理层加密技术,其能够适用于高速率、大容量以及长距离的光纤通信网络。针对QNRC系统中多进制Y-00密文信号的调制及解调受限于高采样速率、高转换深度的ADC芯片的问题,提出了一种利用多个串联相位调制器(PM)进行Y-00密文信号的调制及解调的实现方法,并利用VPItransmission Maker Optical Systems仿真软件对该实现方案进行了仿真验证及性能分析。仿真结果表明:基于多个PM串联的方式,实现了密文态数目为126、数据速率为10 Gbit/s以及1000 km光纤放大链路传输的相移键控-量子噪声随机加密(PSK-QNRC)系统;降低密文量子态的介观功率有利于提高QNRC系统的安全性水平,但同时会损害系统的传输性能,因此选择合适的介观功率对于优化系统的安全性和可靠性具有重要意义。

Quantum-noise randomized cipher(QNRC)is a kind of physical-layer encryption technology based on Heisenberg uncertainty principle,which can be applied to high-speed,large capacity and long-haul optical fiber communication network.In order to solve the problem that the modulation and demodulation of M-ary Y-00 ciphertext signal in QNRC system is limited by ADC chip with high sampling rate and high conversion depth,a method to modulate and demodulate Y-00 ciphertext signal is proposed by using multiple phase modulators(PMs)in series,and the performances of the proposed scheme are verified by using VPItransmission Maker Optical Systems simulation software.The simulation results show that based on the series structure of multiple PMs,a phase shift keying-quantum noise random encryption(PSK-QNRC)system with 126 ciphertext states,10 Gbit/s data rate over 1000 km optically amplified links is realized.And it is also shown that reducing the mesoscopic power of the ciphertext quantum state can improve the security level of QNRC system,but it will damage the transmission performance of the system at the same time.Therefore,it is very important to select the appropriate mesoscopic power to optimize the security and reliability of QNRC system.