用于量子保密通信系统的偏振控制算法研究

量子保密通信是近年来逐渐发展成熟的一种新型保密通信机制，其安全性建立在量子力学基本原理上，被证明具有信息论条件下的绝对安全性。偏振编码光纤量子保密通信系统使用光子的偏振态进行信息编码。当环境变化时，光纤传输特性的改变将导致光子偏振态变化。因此，光子偏振态的补偿控制是光纤量子保密通信系统的一项关键技术，能否快速、准确的对偏振态进行补偿将直接影响系统的通信性能。本文提出一种基于光纤偏振控制器和扫描控制算法的偏振补偿方案。该方案通过控制光纤偏振控制器的电压大小，将量子误码率最小化，实现偏振光的补偿控制，满足量子通信系统自动控制的要求。

Research on the Arithmetic of Polarization Control for Quantum Secure Communication

As a novel mechanism for secure communication, quantum secure communication has been developed for almost thirty years and has been achieved significant improvements in recent years. The security of quantum secure communication is based on a series of principles of quantum mechanics, and has been proven to be an unconditional security under the condition of information theory. The polarization-encoding fiber quantum secure communication system uses polarized photons for information coding. Unfortunately, environmental changes will alter the transmission characteristics of the fiber, and leads to the change of polarization state of photons. So the polarization compensation is a key technique for fiber quantum secure communication system. The performance of the polarization compensation will influence that of the quantum secure communication system. In this paper, we propose a method on account of fiber polarization controller and arithmetic based on scanning control. By controlling voltages of the fiber polarization controller and minimizing the quantum bit error rate, the polarization compensation archived, which satisfies the requirements of automatic control for the quantum secure communication system.