Research On Quantum Secret Information Transmission Scheme With Multi-Party Participation

Due to the excellent properties of quantum communication in terms of communication efficiency and security,quantum communication is more and more widely used in the field of information security.Among them,quantum information transmission is an important part of quantum information science,and its theoretical implementation needs to be continuously optimized to improve efficiency and reduce implementation difficulty.At the same time,the existence of quantum noise in the environment has a non-negligible impact on the realization of quantum information transmission systems.Therefore,in this thesis,we mainly study the multi-party quantum secret information transmission scheme.(1)An asymmetric quantum dialogue scheme based on the Bell state and the Cluster state is proposed.Based on the entanglement swapping between two-qubit Bell state and four-qubit Cluster state,the private information transmitted by Alice to Bob does not equal to the amount of information received from Bob.Thus,the problem that existing quantum dialogue schemes can only transmit private information with equal capacity is solved effectively.Therefore,the proposed scheme is more consistent with the real communication scenario and reduces the redundancy of information in the existing schemes.In addition,we extend the scheme to scenarios based on a single controller and multiple controllers,respectively.(2)The effect of quantum noise on parallel quantum key agreement mechanism is studied.Taking one multi-qubit GHZ state as the quantum distribution state of the parallel quantum key agreement process,the effects of four kinds of quantum noise on the quantum key agreement are studied respectively.In addition,we analyze the measurement fidelity of the output state with respect to the number of quantum bits and the noise factor.(3)Based on multiple routing paths,a sharing scheme of Dicke state is proposed.In the solution,the source node can teleport the Dicke state in parallel through multiple routing paths.In this way,the burden of some intermediate nodes and network congestion will be greatly reduced.In addition,the scheme only requires two-qubit Bell state measurements and single qubit unitary operations.Therefore,the complexity of the technical requirements of the scheme is lower.That is,the solution is more feasible and easier to implement.