关键词: 受控超密编码, 酉变换, 非对称3粒子纠缠态, 量子安全通信, 平均信息量

Abstract: One scheme for controlled superdense coding using threeparticle asymmetric state as quantum channel is investigated, Alice transmit information to Bob by introducing an auxiliary particle d and constructing unitary transformation matrix, where the supervisor (Cliff) can control the average amount of information transmitted from the sender (Alice) to the receiver (Bob) by adjusting the measurement angle, Quantum secure teleportation has been realized. The scheme may be extended to superdense coding for other threequbit asymmetric state with entanglement.

Key words: controlled superdense coding, unitary transformation, three-particle asymmetric entangled state, quantum secure teleportation, average amount of information