Analysis Of Open-destination Quantum Teleportation Network Using Four-partite Entangled States Of Light

With the vigorous development of more than 30 years,the combination of quantum mechanics and information science has formed a new interdisciplinary subject,quantum informatics.Quantum information has developed rapidly in recent years and attracted widespread attention.The quantum entangled state is the important resource of quantum information,and its degree is the key factor to process quantum information research.Enriched entanglement resources are the necessary condition for the study of quantum information,and they are the basic resources for constructing large-scale quantum networks.Therefore,increasing the entanglement degree of the entangled states and expanding the parties of entangled optical fields is one of the main research topics of many research groups.With the increase of entangled light field entanglement parties,its entanglement type is also more abundant.With the complex structure of multi-partite entangled states,it can be realized that not only achieving the widening of the transmission type of quantum teleportation,but also providing the possibility of constructing open-destination transmission quantum network.This kind of open-destination transmission quantum communication network will inevitably play an important role for longdistance quantum information transmission and quantum computing in the future.The main researches in this thesis are as follows:(1)It mainly introduces various multi-partites entangled states of continuous variables,including the concept of four-partite Cluster entangled state,four-partite GHZ entangled state,eight-partite Cluster entangled state,experimental preparation methods,and theoretical criteria.(2)Based on the continuous variable four-partite GHZ entangled state which has been successfully prepared in the laboratory as the entanglement source,the theoretical scheme of the open-destination teleportation network is proposed.The fidelity is discussed when the coherent state is used as the input state,and the experimental feasibility of the scheme is analyzed,which provide reference for subsequent experiments.