**5. Quantum teleportation network**

Quantum teleportation (QT) is a quantum information transmission method that uses the uncertain properties of quantum entanglement to realize the remote transmission of quantum states. This part will introduce the existing research about QTNs briefly, including the point-to-point QT mechanism and multi-Hop QT networking mechanism.

## **5.1 Point-to-point QT mechanism**

Point-to-Point QT mechanism [33] is based on quantum entanglement exchange [34]. The basic principle of quantum entanglement exchange is as follows: The purpose of quantum entanglement exchange is to generate quantum entanglement between quantum systems that have never directly interacted through certain physical processes. Entanglement swapping has great application prospects in quantum communication and quantum information networks, such as preparing entanglement and extending the distance of quantum communication [35]. As **Figure 6** shows, suppose particles A, B and particles C, D are two sets of EPR entangled pairs, respectively. Performing the Bell basis joint measurement of particles B and C, particles A and D is also in an entangled state and is in the same entangled state

**Figure 6.** *Example of a one-hop, first-generation quantum repeater [36].*

as particles 2 and 3, so that the entanglement exchange is successfully realized, and the point-to-point QT mechanism is completed.
