Information gain and systems entanglement in tripartite measurement model

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.

Automated summary

The paper discusses how obtaining information of a quantum system through quantum measurements can bring disturbances to the system and affect the entanglement between arbitrary bipartite systems. By modeling the measurement process as tripartite systems and defining various information quantities, the relationships between information gain and entanglement in the tripartite systems are explored.