Impurity in Pairwise Entanglement of Heisenberg XX Open Chain

• Published in: Communications in theoretical physics Vol. 48; no. 12; pp. 1009 - 1016
• Main Author: XI Xiao-Qiang~(1,2)CHEN Wen-Xue~1 LIU Qi~3 and YUE Rui-Hong~3~1 Department of Applied Mathematics and Physics,Xi’an Institute of Posts and Telecommunications,Xi’an 710061,China~2 Joint Laboratory of Advanced Technology in Measurements,Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,the Chinese Academy of Sciences,Beijing 100080,China~3 Institute of Modern Physics,North-West University,Xi’an 710069,China
• Format: Journal Article
• Language: English
• Published: IOP Publishing 15.12.2007; Joint Laboratory of Advanced Technology in Measurements, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, the Chinese Academy of Sciences, Beijing 100080, China%Department of Applied Mathematics and Physics, Xi'an Institute of Posts and Telecommunications, Xi'an 710061, China%Institute of Modern Physics, North-West University, Xi'an 710069, China; Department of Applied Mathematics and Physics, Xi'an Institute of Posts and Telecommunications, Xi'an 710061, China
• Subjects: chain; entanglement; Heisenberg; impurity; pairwise; system; Heisenberg ⅩⅩ chain; system impurity; pairwise entanglement
• ISSN: 0253-6102
• DOI: 10.1088/0253-6102/48/6/010

<正> We calculate the concurrence of all pairwise entanglement of Heisenberg XX open chain with single systemimpurity in three-qubit and four-qubit cases,and find that the impurity parameter J_i has great effect on pairwiseentanglement.Choosing the proper parameter J_i,we can obtain the maximal pairwise entanglement of the nearestqubits and make the non-nearest qubits entangle.