It is well known that obtaining information of the quantum system can be performed by quantum measurements. However, it also brings disturbance to the system and affects the entanglement between arbitrary bipartite systems. Firstly, based on the introduction of the purification system, the measurement process has been modeled as the tripartite systems. Then, the definitions of various information quantities are provided. Finally, we discuss the relationships between information gain and entanglement in the tripartite systems.

中文翻译：

---

三方测量模型中的信息增益和系统纠缠

众所周知，可以通过量子测量来执行获得量子系统的信息。但是，这也给系统带来了干扰，并影响了任意二分系统之间的纠缠。首先，在引入纯化系统的基础上，将测量过程建模为三方系统。然后，提供各种信息量的定义。最后，我们讨论了三方系统中信息获取与纠缠之间的关系。