Journal
OPTICS COMMUNICATIONS
Volume 281, Issue 8, Pages 2331-2335Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2007.12.002
Keywords
quantum teleportation; quantum circuit; positive operator-valued measure; W state
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A protocol for three-party controlled quantum teleportation is discussed. It is shown that an unknown two-particle entanglement can be teleported to any one of two receivers via the only one three-particle W state. We summarize all different unitary transformations performed by the receiver with a concise formula. The quantum circuits for the generalized measurement described by positive operator-valued measure (POVM), which is utilized to probabilistically distinguish the two non-orthogonal states, are explicitly constructed by means of quantum Toffoli gates. The efficient quantum circuits for implementing the teleportation are also provided. (C) 2007 Elsevier B.V. All rights reserved.
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