期刊
PHYSICS LETTERS A
卷 369, 期 5-6, 页码 377-379出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2007.05.001
关键词
quantum channel; transformation operator; four-qubit entangled state
Recently, Yeo and Chua [Y. Yeo, W.K. Chua, Phys. Rev. Lett. 96 (2006) 060502] gave a protocol for faithfully teleporting an arbitrary two-qubit state via a genuine four-qubit entangled state, which is not reducible to a pair of Bell state. Here, we present a transformation operator to give a criterion for faithful teleportation of an arbitrary two-qubit state via a four-qubit entangled state. The theoretical explanations of some quantum channels are given in term of transformation operators. The relation between the transformation operators and the Bell base measurement is also obtained. Furthermore, a new four-qubit entangled state quantum channel is presented. (C) 2007 Elsevier B.V. All rights reserved.
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