在构成这些算符时，我们不会陷入任何非对易性问题中。

We won't run into any problem of non - commutativity in constructing these operators.

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在构成这些算符时，我们不会陷入任何非对易性问题中。

We won't run into any problem of non-commutativity in constructing these operators.

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研究了双光子非共振作用系统中纯度和密度算符间距的特性。

The time evolution properties of purity and distance between density operators in two photon non resonant interaction system are studied.

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