Analysis of Multi-user Quantum Teleportation Networks
With the rapid development of quantum communication technology,quantum teleportation as an important quantum com-munication scheme has received widespread attention and has become one of the most important protocols in quantum information processing technology.The earliest quantum teleportation are natural two-partite processes for transferring unknown quantum states from one node to another.So far,deterministic quantum teleportation has been demonstrated in three-user networks,and as quantum information research progresses,quantum states or quantum information need to be transferred between more and more nodes.Therefore,multi-user quantum teleportation networks are considered to be the basis of the future quantum internet.However,a versa-tile and deterministic quantum teleportation network for different combinations of users is currently needed to meet the practical requirements,and thus the construction of continuously variable multi-user quantum teleportation networks is necessary.In this paper,we propose the construction of a multi-purpose quantum teleportation network using a four-partite Greenberger-Horn-Zeilinger(GHZ)entangled state of light,and the proposed four-partite quantum teleportation network can be constructed as a communication system containing one or two subnets.Users in this network can be flexibly associated as a subnetwork,and des-ignated users can be selected to cooperate as needed,and different quantum teleportation networks are implemented under differ-ent cooperation methods,which realises the flexibility of network construction.Meanwhile,the physical conditions of implement-ing different networks are analysed in detail to provide a reference for obtaining high-fidelity and high-flexibility quantum telepor-tation networks.The results show that in order to ensure the efficient operation of the quantum teleportation network,it is necessary to have high-quality entanglement resources,reasonable gain factors,a larger number of controllers,as well as efficient transmission and detec-tion efficiency.With the advantages of flexibility and easy scalability,this scheme can be a useful reference for the realisation of more complex quantum computation and quantum communication networks in the future,using more components of entangled state optical fields,and will provide a general platform for the demonstration of complex quantum communication and quantum computation protocols.
quantum teleportation networkmulti-purposeentangled state of lightfidelity
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