Research On Several Quantum Communication Methods Based On Brown State

Quantum informatics is an interdisciplinary subject,covering quantum mechanics and informatics,etc,in which quantum computing and quantum communication are two important branches.Quantum entanglement is an important communication resource,which has a far-reaching influence and wide application in quantum communication protocols.Quantum remote state preparation and teleportation are two important branches of communication protocols.In 2005 scientists firstly reported a new type of five-particle maximally entangled state Brown state that could be used for quantum communication.In recent years,there have been some studies based on the Brown state in quantum communication because of its good stability.This paper mainly proposes several new quantum communication methods based on the Brown state.(1)We propose a scheme of controlled remote state preparation of two-qubit state based on a five-qubit Brown state.A scheme of controlled multi-party joint remote state preparation of three-qubit state based on a five-qubit Brown state are implemented.In addition,a scheme of multi-party controlled bidirectional remote state preparation of single-qubit states based on a five-qubit Brown state is proposed in which the security is enhanced because of the existence of multiple controllers.(2)We propose a scheme of controlled remote preparation of two-qubit state which combines network coding with quantum remote state preparation.Based on a five-qubit Brown state and network coding.In addition,a scheme of controlled bidirectional remote preparation of single-qubit state is proposed,which combines the two-way communication parties.Due to the network coding,the throughput and transmission efficiency of communication networks is enhanced.(3)We propose an improved scheme based on a scheme of quantum teleportation of transmitting unknown five-qubit state via a seven-qubit cluster state.This scheme has the advantages of consuming less classical resources,possessing higher transmission efficiency and lower operation complexity compared with the previous scheme.