Research On Bidirectional Quantum Teleportation And Networking Technology Of Wireless Quantum Communication Network

Quantum information science is a new type of interdisciplinary discipline formed by quantum mechanics and informatics.It is the extension of the informatics.Quantum communication technology is a hot topic in the field of Quantum information science.Quantum teleportation is the main mode of quantum state information transmission in Quantum communication.Building a high-performance wireless quantum communication network has gradually become a hot topic in the field of quantum communication.The work mainly includes two parts.One is to study and design a bidirectional quantum teleportation protocol with unidirectional and bidirectional control;the other is to design a new wireless quantum communication network model under the Mesh backbone structure and present multi-hop bidirectional quantum teleportation based on this model.Firstly,single hop undirectional control and bidirectional control bidirectional quantum teleportation protocol are iproposed.In the first protocol,the joint entanglement of W-like state and Bell state is used as quantum channel.After CNOT operation and a series of single-particle measurement,the original quantum information can be successfully recovery.Compared with the double-Bell state bidirectional quantum teleportation protocol,this protocol has the advantages of simple circuit,convenient operation and one-way controlled.Then,in order to achieve bidirectional controlled,we improve the quantum channel and use five-particle cluster state entanglement.In the quantum channel,when the third party measures and sends the outcome,both sides of the communication realize the entanglement that the two parties shared before.Compared with other bidirectional quantum teleportation,this scheme has the advantages of easy preparation and distribution of entangled particles,simple circuit and easy measurement operation.The most important thing is to introduce a third party to achieve bidirectional control.At last,in socket secure layer,a new application of two proposed protocols is introduced.Secondly,based on the backbone structure of Mesh network,a hierarchical distributed wireless quantum-communication-network model that consists of four types of node and two communication links is proposed.Then,we redefine the nodes functions where entangled node is responsible for the preparation and distribution of entanglement,the intermediate node and edge node constitute the backbone network,the edge node provides terminal node access.Finally,in order to implement multi-hop bidirectional controlled quantum teleportation in wireless quantum communication networks,a multi-hop bidirectional quantum teleportation using intermediate nodes to construct the path is proposed.This protocol uses entanglement swapping to establish direct quantum channel and parallel measurement to reduce overall transmission delay.Considering the factors such as the preparation and distribution of entangled particles,based on the Bell-pair multi-hop quantum teleportation,arbitrary Bell pairs are used in the backbone network to establish two quantum channels.Arbitrary Bell pair not only enriches the kinds of quantum channel in the backbone network,but also has simple preparation and high measurement success rate.In the N-hop quantum teleportation using arbitrary Bell as quantum channel,the general formula of recovering original quantum state is given by introducing the measuring matrix and quantum channel matrix.Between the client node and the edge node,the fiveparticle cluster entanglement is used as quantum channel to implement bidirectional control.The quantum channel between edge node and client node is used to achieve bidirectional control.At last,the feasibility of the protocol is verified by formula derivation.