An important property of entanglement： pairwise entanglement that can only be transferred by an entangled pair  

作　　者：惠小强 刘伍明 

机构地区：[1]Department of Applied Mathematics and Physics, Xi'an Institute of Posts and Telecommunications, Xi'an 710061, China [2]Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China

出　　处：《Chinese Physics B》2007年第7期1858-1862,共5页中国物理B（英文版）

基　　金：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）.

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.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.

关 键 词：pairwise entanglement transfer of entanglement Heisenberg XX chain 

分 类 号：O41[理学—理论物理]