Supported by the National Natural Science Foundation of China (Grant Nos. 10547008, 90403034, 90403019, 90406017 and 60525417);the National Key Basic Research Special Foundation of China (Grant Nos. 2005CB724508 and 2006CB921400);the Foundation of Xi’an Institute of Post and Telecommunications (Grant No. 105-0414);the Natural Science Foundation of Shanxi Province (Grant No. 2004A15)
The characteristics of pairwise entanglement and local polarization (LP) are dis-cussed by studying the ground state (states) of the Heisenberg XX model. The re-sults show that: the ground state (states) is (are) comp...