Design And Performance Simulation Of Compatible Quantum Communication Network

Quantum communication is a merging interdiscipline which is a combination of Quantum Mechanics and communication theory. By the development for more than thirty years, it is widely experimental in the lab and will come to apply in practical. Quantum communication has many advantages, including high speed, huge capacity and unconditional security, which bring it a pretty good development potential and application prospect.It has attracted the attention of academia, industry and the defense and became a hotspot.Quantum communication stems from the requirement of secure communication. With the rapid development of information and technology, information security which is also closely related to personal interest has attracted the attention of Internet, instant messaging and E-commerce. With the principle of quantum mechanics, quantum communication ensure unconditional security of quantum key distribution.Meanwhile, combined with One-Time-Pad protocol, it guarantees the communication absolute safety.While in theory QKD is unconditionally secure, in practice, however, there is a great gap between the assumptions made in the security proofs of QKD and the actual implementations. The practical problem is that the key rate of quantum key distribution decreases with the growing of communication distance. At the same time, owing to the imperfection of single photon source and device, the communication system has suffer from a series of attack such as PNS attack, time-shift attack and so on,which requires careful and thoughtful consideration before deploying quantum communication.In this thesis, firstly,I give a brief overview of both the domestic and foreign development of the quantum secure communication ranging from theory to practical experiment. Secondly, I present an introduction of the theoretical foundations of quantum secure communication, which incorporates Heisenberg’s Uncertainty Principle and quantum no-cloning theorem as well as Relevance and Nonlocality of entangled particles. The two basic QKD protocals, BB84 and B92 are followed.Thirdly, two kinds of QKD, Decoy-QKD and MDI-QKD is described in Chapter 3, which is the critical component of theory in this thesis. It has been proven that the integration of quantum communication and classical communication is possible by theory research and practical experiment. So, for the sake of enhancing resource available utilization and decreasing the cost of the deployment of quantum communication network, we can take the integration into consideration. For the aim that has been mentioned, we need do related simulation as the first step which includes several parts that is described in Chapter 4.Before simulation, we have several work to do, such as designing quantum communication network topology, projecting routing algorithms according to two different kinds of QKD. In this paper, simulation of different cases such as different traffic, three different number of routes between a pair of Calling Subscriber and different kinds of key rate. When the network traffic is stable, we can distribute different key rate according to the probability of the related link used so that reduces the cost of device on the premises of meeting the requirement of communication.The simulation results by OPNET provide a reference for network construction in practical ensuring a reasonable cost and feasibility. We can hope the Communication Network can benefit everyone some day.However,there still exist some disadvantages, such as the network service is single, the network scale is not large enough, and the network traffic is relatively stable. In the furture, we should take these into consideration in the deployment of quantum communication network to adapt to the burst nature and uncertainty of the network.