density operator

例句：

1. 1. In quantum mechanics,the density operator is used to describe thewave function of a system.
   在量子力学中，密度算子用于描述系统的波函数。
2. 2. The density operator is crucial forsolving many complex problems in physicsand engineering.
   密度算子对于解决物理和工程中的许多复杂问题至关重要。
3. 3. Thedensity operator can be used to calculate theprobability of finding a particle at a specificlocation.
   密度算子可以用来计算找到特定位置的粒子的概率。