通过量子力学系统的基本概念，解释基本的薛定谔方程。
Basic SchrOdinger equation is explained by means of the fundamental concept of quantum mechanical system.
因为QKD系统是对单量子态的操作，因此QKD系统本质上是量子力学系统。
In order to understand the quantum information processing in QKD system, complete quantum mechanics method was employed to describe QKD system.
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