| With the further development of large-scale quantum network technology,the globalization of quantum network has become an inevitable trend.As an important application and basic guarantee in quantum network,the efficient transmission technology of quantum information between multiple users has made continuous breakthroughs in various fields in recent years,especially in the field of military information security,which is applied to secure communication,exact position determination,position-based access to data,and improved sensing capabilities,etc.,providing technical support for military information construction.Quantum entanglement,as the key resource of quantum network construction,has attracted much attention.In multi-party information transmission,quantum teleportation and remote state preparation based on multi-qubit entanglement are widely used because of their instantaneous,nonlocal,irreversible and classical resource saving characteristics.Therefore,the research on efficient multi-party quantum information transmission protocol based on multi-qubit entanglement channel is of great significance in military security communication.However,in the actual information transmission environment and decoherence interaction,the entanglement characteristics of multi-qubit entangled states are often difficult to prepare or maintain,thus the information transmission mode based on partially entangled channel is also the focus of this dissertation.Based on these,this dissertation mainly focuses on multi-qubit entangled channel and partial entangled channel,in order to solve the synchronous transmission requirement of quantum information in the network,utilize the quantum teleportation and remote state preparation to complete the multi-mode efficient information synchronous transmission protocol between multi-node users in the quantum network,and complete the circuit design and platform simulation verification.The main research achievements and innovations are as follows:1.The theory of multiparty quantum broadcast and multicast based on multi-qubit entangled channel is studied,and some quantum broadcast and multicast protocols are proposed for synchronous transmission of information to multiple receivers.In order to solve the synchronous transmission requirements of quantum information in the network,through the analysis of the composition of quantum channel,the logic circuit is designed,the mathematical model is established,and the efficient quantum broadcast and multicast information transmission protocols are proposed to realize the efficient synchronous transmission of the same or different information by multiple receivers.Specifically,by constructing appropriate orthogonal measurement basis matrix and entangled states,two protocols are proposed to enable two receivers to obtain the same single-qubit state and two different two-qubit state synchronously.In addition,with the increase of the number of participants,the general quantum broadcast and multicast protocols are introduced,where the same or different quantum states are simultaneously received by the n receivers based on a 2n-qubit entanglement channel.Theoretical analysis shows that the proposed protocols are simple to implement,can ensure the synchronization and diversity of multi-party information transmission.2.The theory of multi-output quantum teleportation based on multi-qubit entangled channel is studied,and some quantum teleportation protocols are proposed to transmit different quantum information to different receivers.In order to meet the requirement of synchronous transmission and information diversification,a multi-output quantum teleportation protocol is proposed for synchronous transmission of an arbitrary single-qubit state and an arbitrary two-qubit state to two receivers,and the quantum circuit design is optimized on the IBM Q experimental platform.Then the average error between experimental and theoretical data is obtained by simulation.In addition,the performance of the protocol is analyzed through four kinds of classical noise,and the fidelity is calculated to measure the impact of the quantum channel after passing through the noise environments.Finally,a multi-output quantum teleportation protocol is proposed for simultaneous transmission of a m-qubit and a(m+1)-qubit GHZ-like state.Theoretical analysis shows that the proposed protocols can be implemented with high success probabilities,and the synchronous and efficient transmission of different quantum state information are realized.3.The theory of multicast remote state preparation based on partially entangled channel is studied,and some remote state preparation protocols are proposed,which can transmit information from one node to multiple nodes synchronously and efficiently.Aiming at the influence of decoherence and environment,three multi-cast remote state preparation protocols are proposed through different partially entangled channels.Firstly,two multi-cast remote state preparation protocols with certain probability are proposed to help two receivers prepare two different two-qubit states and two different four-qubit cluster states.In order to improve the success probabilities of this kind of protocols,a nine-qubit partially entangled channel is constructed to transmit a single-qubit state and a two-qubit state simultaneously to two receivers without introducing auxiliary particle.In particular,the success probability of the protocol is 100%,independent of its channel parameters.Finally,the performance of the above protocols are analyzed from three aspects: the success rate,the intrinsic efficiency and the security analysis.The analysis shows that the protocols have high intrinsic efficiency in the remote state preparation protocols taking partially entangled states as the quantum channels.In the research of efficient multi-party quantum information transmission,this dissertation solves the synchronization problem of information transmission to multi-user,and improves the efficiency of information transmission.In addition,in order to solve the problem that it is difficult to prepare and maintain the multi-qubit entangled state in the real environment,a multi-party remote state preparation protocol independent of channel parameters is proposed by the partially entangled channel.Therefore,the proposed protocols achieve the highest probabilities of success and the best utilization of qubits in theory. |
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