Research On Quantum Network Scheme Based On Measurement Device Independent Quantum Key Distribution Protocol

The basic principles of quantum mechanics guarantee the unconditional security of quantum communication,and quantum key distribution(QKD)is an important part of quantum communication.The measurement-device-independent quantum key distribution(MDI-QKD)protocol could solve the security loophole at detectors effectively while ensuring the unconditional security,and double the communication distance.With the maturity of QKD technology,secure communication between two users can be guaranteed,but quantum networks suitable for multi-user secure communication are still under study.To improve the number of legitimate users in QKD,the thesis proposes a quantum network scheme based on Plug-and-Play(P&P)MDI-QKD and a long-distance MDI-QKD quantum network scheme based on quantum teleportation.The main works are following:(1)We proposes a long-distance MDI-QKD protocol based on quantum teleportation.The new protocol combines quantum teleportation with MDI-QKD.Alice and Bob prepare quantum states,then Alice sends her quantum state to the intermediate user David who is far away,finally,David sends the quantum states to a third party with Bob.The deduction of the key generation rate is presented and the simulation results show that the key generation rate and the secure transmission distance of the new protocol is improved in comparison with that of the conventional MDI-QKD protocol,and the new protocol is suitable for building a quantum security network.(2)Moreover,We gives a long-distance MDI-QKD quantum network scheme.In this scheme,any two authorized users in the network can establish a secure communication link based on different routing schemes.Compared with the original MDI-QKD protocol,the network scheme improves the number of communication users,then the thesis presents the quantum network scheme,and describes the operation process of the network theoretically.(3)Finally,We proposes a quantum network scheme based on Plug-and-Play MDI-QKD to improve the number of communication users.the network scheme is presented and a theoretical analysis of its operation process is described.Compared with the original MDI-QKD protocol,the network scheme improves the security while improving the number of communication users.In addition,in order to improve the practicability of the network,combined with the business characteristics of grid data transmission,an international business data transmission scheme based on Plug-and-Play MDI-QKD protocol is proposed,and the operation process of the scheme isdescribed in detail and feasibility.