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Optoelectronics Letters 2006年第6期2卷 455-458页

作者： ZHOU Nan-run GONG Li-hua LIU Ye Department of Electronics Information Engineering Nanchang University Nanchang 330029 China

In this letter a cascade quantum teleportation scheme is *** proposed scheme needs less local quantum operations than those of quantum multi-teleportation.A quantum teleportation scheme based on entanglement swapping is presented and compared with the cascade quantum teleportation *** two schemes can effectively teleport quantum information and extend the distance of quantum communication.

关键词：叶栅量子运输纠缠交换技术量子无线电物理

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Alternative and Secure Direct Communication with W State

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湖南科技学院学报 2005年第11期26卷 186-189页

作者：汪新文刘翔 Department of physics Hunan University of Science and Engineering Yongzhou 425006 Department of physics Hunan Normal University Changsha 410081

A theoretical scheme for alternative and secure direct communication is proposed. The communication is based on controlled quantum teleportation via state. After insuring the security of the quantum channels (a set of qubits in the states), Alice encodes the secret messages directly on a sequence of particle states and transmits them to Bob supported by Charlie, or to Charlie supported by Bob, using controlled quantum teleportation. Bob or Charlie can read out the encoded messages directly by the measurement on his qubits. In this scheme, the controlled quantum teleportation transmits Alice's message without revealing any information to a potential eavesdropper. Because there is no a transmission of the qubits carrying the secret messages between legitimate parties in the public channel, it is completely secure for direct secret communication if perfect quantum channel is used. We also discuss that when one of the three legitimate parties does not cooperate with others because of some reasons, the remaining two persons can still communicate with each other by entanglement purification. The main feature of this scheme is that the communicate between two sides is alternative but depends on the agreement of the third, and more over, the communication between two sides does not suspend with loss of one of three qubits ( i.e., one of the three legitimate parties does not cooperate with others).

关键词：量子无线电物理换向器计算机网络编码技术

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