The Research Of Quantum Network Coding Based On Butterfly Network

Quantum network communication which has a rapid development in theoretical research and practical deployment has an important effect in the quantum information science. In order to tackle the problem of security and transmission of information in the quantum network communication system, quantum network coding has become a hotspot in quantum information processing.This thesis proposes a fashion of the quantum network coding scheme to ensure the security of a small-scale network while increasing the efficiency of transmissions. Consequently, we investigate the integration of super-dense coding and hyper-entanglement with the quantum network communication system based on the mechanisms of quantum entanglement of multiple photons.Firstly, the basic principles of quantum mechanics and the key technologies which play an important role in the research of the quantum network coding will be investigated. Secondly, the quantum network coding protocols which be proposed by Hayashi and Ma Song-Ya will be discussed in the base of the classical network coding protocol. Thirdly, for the deficiency of the Ma’s protocol, this thesis makes some innovations of quantum network coding with super-dense coding based on the controlled quantum teleprtation. Comparing with Ma’s protocol, the security and coding efficiency of our protocol are substantially improved. Fourthly, the above mentioned protocol will be improved in the assistance of the hyper-entanglement, and the encoding efficiency will be further improved. Finally we analyze the security and efficiency of the proposed schemes to ensure the secure transmission of the encoded information.