| An important property of entanglement： pairwise entanglement that can only be transferred by an entangled pair |
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| 引用本文： | 惠小强,刘伍明.An important property of entanglement： pairwise entanglement that can only be transferred by an entangled pair[J].中国物理 B,2007,16(7):1858-1862. |
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| 作者姓名： | 惠小强 刘伍明 |
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| 作者单位： | Department of Applied Mathematics and Physics,
Xi'an Institute of Posts and
Telecommunications, Xi'an 710061, China
；Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China;Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China |
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| 基金项目： | Project supported
in part by the National Natural Science Foundation of China
(Grant No 10547008), and the Foundation of Xi'an Institute of
Posts and Telecommunications, China (Grant No 105-0414). |
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| 摘 要： | Based on the calculation of all the pairwise entanglements in the n （n ≤ 6）-qubit Heisenberg XX open chain with system impurity, we find an important result： pairwise entanglement can only be transferred by an entangled pair. The non-nearest pairwise entanglements will have the possibility to exist as long as there has been even number of qubits in their middle. This point indicates that we can obtain longer distance entanglement in a solid system.
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| 关 键 词： | 障碍物 海森堡 物理研究 纤缠 |
| 收稿时间： | 2006-09-11 |
| 修稿时间： | 2006-09-112007-01-25 |
An important property of entanglement: pairwise entanglement that can only be transferred by an entangled pair |
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| Xi Xiao-Qiang and Liu Wu-Ming.An important property of entanglement: pairwise entanglement that can only be transferred by an entangled pair[J].Chinese Physics B,2007,16(7):1858-1862. |
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| Authors: | Xi Xiao-Qiang and Liu Wu-Ming |
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| Institution: | Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China; Department of Applied Mathematics and Physics,
Xi'an Institute of Posts and
Telecommunications, Xi'an 710061, China
；Beijing National Laboratory for Condensed Matter Physics,
Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | Based on the calculation of all the pairwise entanglements in the n
( n \leq 6 )-qubit Heisenberg XX open chain with system impurity, we
find an important result: pairwise entanglement can only be
transferred by an entangled pair. The non-nearest pairwise
entanglements will have the possibility to exist as long as there has
been even number of qubits in their middle. This point indicates that
we can obtain longer distance entanglement in a solid system. |
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| Keywords: | pairwise entanglement transfer
of entanglement Heisenberg XX chain |
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