Abstract:

Using a 9-quantum cluster state as the channel, three protocols of asymmetric bidirectional quantum infor-mation transmission for the 2-qubit and 3-qubit states are proposed, respectively. In the first protocol, Alice can tele-port the 3-qubit unknown state of qubits [a1],[a2] and [a3] to Bob, Bob can transfer his 2-qubit unknown state of qubits [b1] and [b2] to Alice. Alice uses a special measurement basis of 3-qubit states, which simplifies the scheme by half. In the second protocol, Alice can remotely prepare the 3-qubit known state of qubits [a1],[a2] and [a3] at Bob??s site, at the same time Bob can also remotely prepare the 2-qubit known state of qubits [b1] and [b2] for Alice. Because they make full use of the feedforward measurement strategy, the preparation task can be completed perfectly. In the third protocol, using the advantages of the first two protocols, Alice can successfully teleport the 3-qubit unknown state of qubits [a1],[a2] and [a3] to Bob, and Bob can also perfectly prepare the 2-qubit known state of qubits [b1] and [b2] at Alice??s site.

Key words: quantum communication, asymmetric teleportation, asymmetric remote state preparation, asymmetric bidirectional quantum information hybrid transmission, 9-qubit entangled state

摘要：

利用一个9-量子团簇态为信道，分别提出了三个关于二量子态和三量子态的双向量子信息传输协议。在第一个协议中，Alice能把三量子[a1]、[a2]和[a3]的未知态传送给Bob，Bob能把二量子[b1]和[b2]的未知态传送给Alice。Alice采用特殊三粒子态测量基，使得方案简化了一半。在第二个协议中，Alice在远方的Bob处制备三粒子[a1]、[a2]和[a3]的已知态，同时Bob也能在Alice处制备二量子[b1]和[b2]的已知态。由于他们充分利用了前馈测量策略，制备任务能够完美完成。在第三个协议中，利用前两个协议的优点，Alice能成功将三量子[a1]、[a2]和[a3]的未知态传送给Bob，Bob也完美地在Alice处制备二量子[b1]和[b2]的已知态。

关键词: 量子通信, 非对称隐形传态, 非对称远程态制备, 非对称双向量子信息混合传输, 9-量子团簇态