采用几何代数的方法对两能级量子系统的状态进行描述与特性分析,借助于量子系统的密度矩阵,对量子纯态和混合态的几何表示进行了详细的推导,对比Bloch矢量与几何代数的表示方法,给出2种表示法之间的对应关系.
In this paper, we use geometric algebra to describe the state of two levels quantum system and analysis its property. And we deduce the geometric algebra expression of quantum pure state and mixed state by making use of the density matrix. Then we can obtain the relationship of the Bloch vector and the geometric algebra description by contrasting the two descriptive methods.