%0 Journal Article
%T Multipartite entanglement in the Heisenberg XX chain with impurity<br>多量子位Heisenberg XX链中的杂质纠缠
%A Qin Meng
%A <br>秦猛
%J 物理学报
%D 2010
%I 
%X We studied the entanglements of the Heisenberg XX chain with impurity in the presence of a uniform magnetic field along the z axes by means of negativity. Through analyzing NL-A and N1-A, we show that the critical temperatures for nonzero negativities depend on the impurity parameter J1 and the magnetic field B. It is also shown that as qubit L increases, the entanglements increase when L is odd but decrease when L is even. And the entanglements of the even-qubit chains are larger than those of the odd-qubit chains. The condition is similar with L=3 for NL-A when qubit L is odd, but the entanglements increase with the increase of even qubit L.
%K entanglement
%K impurity
%K multipartite
%K Heisenberg XX chain<br>纠缠，
%K 杂质，
%K 多量子位，
%K Heisenberg
%K XX链
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=2DCF96D080EA686C1CBD9440ECDF92C3&yid=140ECF96957D60B2&vid=6AC2A205FBB0EF23&iid=E158A972A605785F&sid=A3E26DBFF210DD2D&eid=251B195C0CA64B0A&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=20