| Teleportations of Mixed States and Multipartite Quantum States |
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| 作者姓名： | YU Chang-Shui WANG Ya-Hong SONG He-Shan |
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| 作者单位： | [1]Department of Physic＇s, Dalian University of Technology, Dalian 116024, China [2]School of Information Science and Engineering, Dalian Institute of Light Industry, Dalian 116034, China |
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| 摘 要： | In this paper, we propose a protocol to deterministically teleport an unknown mixed state of qubit by utilizing a maximally bipartite entangled state of qubits as quantum channel. Ira non-maximally entangled bipartite pure state is employed as quantum channel, the unknown mixed quantum state of qubit can be teleported with 1 -√ 1- C^2 probability, where C is the concurrence of the quantum channel. The protocol can also be generalized to teleport a mixed state of qudit or a multipartite mixed state. More important purpose is that, on the basis of the protocol, the teleportation of an arbitrary multipartite （pure or mixed） quantum state can be decomposed into the teleportation of each subsystem by employing separate entangled states as quantum channels. In the case of deterministic teleportation, Bob only needs to perform unitary transformations on his single particles in order to recover the initial teleported multipartite quantum state.
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| 关 键 词： | 混合态 多粒子量子态 量子隐形传态 双粒子纠缠态 量子信道协议 |
| 修稿时间： | 2006-06-262006-09-22 |
Teleportations of Mixed States and Multipartite Quantum States |
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| YU Chang-Shui WANG Ya-Hong SONG He-Shan.Teleportations of Mixed States and Multipartite Quantum States[J].Communications in Theoretical Physics,2007,47(6):1041-1044. |
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| Authors: | YU Chang-Shui WANG Ya-Hong SONG He-Shan |
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| Abstract: | In this paper, we propose a protocol to deterministically teleport an unknown mixed state of qubit by utilizing a maximally bipartite entangled state of qubits as quantum channel. Ifa non-maximally entangled bipartite pure state is employed as quantum channel, the unknown mixed quantum state of qubit can be teleported with 1 - √1 - C2 probability, where C is the concurrence of the quantum channel. The protocol can also be generalized to teleport a mixed state of qudit or a multipartite mixed state. More important purpose is that, on the basis of the protocol, the teleportation of an arbitrary multipartite (pure or mixed) quantum state can be decomposed into the teleportation of each subsystem by employing separate entangled states as quantum channels. In the case of deterministic teleportation,Bob only needs to perform unitary transformations on his single particles in order to recover the initial teleported multipartite quantum state. |
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| Keywords: | teleportation mixed state multipartite quantum state |
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