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Chinese Physics, 2007, Vol. 16(7): 1858-1862    DOI: 10.1088/1009-1963/16/7/009
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An important property of entanglement: pairwise entanglement that can only be transferred by an entangled pair

Xi Xiao-Qiang(惠小强)a)b) and Liu Wu-Ming(刘伍明)b)
a Department of Applied Mathematics and Physics, Xi'an Institute of Posts and Telecommunications, Xi'an 710061, China; b  Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China
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.
Keywords:  pairwise entanglement      transfer of entanglement      Heisenberg XX chain  
Received:  11 September 2006      Revised:  25 January 2007      Accepted manuscript online: 
PACS:  03.65.Ud (Entanglement and quantum nonlocality)  
  03.67.Lx (Quantum computation architectures and implementations)  
  03.67.Mn (Entanglement measures, witnesses, and other characterizations)  
Fund: 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).

Cite this article: 

Xi Xiao-Qiang(惠小强) and Liu Wu-Ming(刘伍明) An important property of entanglement: pairwise entanglement that can only be transferred by an entangled pair 2007 Chinese Physics 16 1858

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Chen Shi-Rong(陈士荣), Xia Yun-Jie(夏云杰), and Man Zhong-Xiao(满忠晓). Chin. Phys. B, 2010, 19(5): 050304.
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