| The research of quantum mechanics has brought a revolution for the information processing and transmission of information, human communication enters the very micro communication era. As one of the newest communication methods which most people expect since the development of computer science, quantum communication has become the research hot spot in the field of communication at home and abroad. In recent years, quantum communication has come from theory to practical. The future direction of quantum communication must be large-scale, multiple region, super long distance direction inevitably. In construction of a large-scale quantum communication network, quantum packet transmission will be one of the key technologies. The communication link which used quantum packet transmission will greatly enhance the quantum communication network utilization and promote to provide more variety and higher rate service. However, the research on quantum packet transmission has not been carried out.In this paper, the transmission of quantum packets in the quantum communication network is studied. The main content of this paper is divided into three parts:Firstly, in order to save entanglement resources, we have put forward one kind of quantum communication network transmission protocol based on packet switching and the theory of quantum teleportation. We have analyzed the reliability, security and utilization rate of entanglement of the protocol we have proposed then. The quantitative relationship about the number of entanglement quantum states, the number of routers and link error rates has been calculated after that. The simulation results show that when the quantum transmission network is not stable, the packet switching transmission protocol has a better transmission performance;Secondly, the distribution of packets in the quantum packet transmission has a great influence on the time delay of the quantum packets. In order to achieve the high speed transmission of quantum block and improve node throughput of the quantum communication network, in this paper, a quantum neural network algorithm based on parallel packet transmission model is proposed. The quantum flow allocation algorithm can set quantum neuron weight matrix and bias value according to the channel error rate to realize the adjustment of the send port group number. The simulation shows that the throughput of neurons and channel fidelity values of entanglement purification and entanglement purification time are correlated:with the improvement of requirements for channel fidelity, neurons throughput will descend gradually, in addition, the neurons are able to send more quantum state to the best state link;Thirdly, in order to reduce the quantum packet queues number in nodes of the quantum communication network and to reduce the transmission delay of quantum packets, at first, according to the classical computer communication network structure, our paper has divided the quantum communication network into quantum local area network, quantum metropolitan area network and quantum wide area network. Then, the quantum packet format and the quantum cluster format compatible with the packet format in the computer network are defined. After that, a quantum information packet transmission scheme based on the hierarchical is proposed to realize the end-to-end transmission of quantum information. At last, the theoretical analysis and calculation are carried out by Matlab simulation. The results show that, hierarchical quantum packet information transmission scheme can effectively reduce the transmission time of quantum packet information in the quantum communication network, and the reduced time is related to the quantum routers’ performance and the number of quantum packets to send. |
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