Quantum circuits for controlled teleportation of two-particle entanglement via a W state |
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Authors: | Xiu-Bo Chen Ning Zhang Song Lin Qiao-Yan Wen Fu-Chen Zhu |
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Affiliation: | a State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China b School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China c National Laboratory for Modern Communications, P.O. Box 810, Chengdu 610041, China |
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Abstract: | 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. |
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Keywords: | 03.67.&minus a 03.65.&minus w |
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