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...
Project supported by the National Natural Science Foundation of China (Grant No 10547008);Specialized Research Program of Education Bureau of Shaanxi Province (Grant No 08JK434);the Youth Foundation of Xi’an Institute of Posts and Telecommunications (Grant No ZL2008-11)
The mixedness of the N-qubit quantum states with exchange symmetry has been studied, and the results show that the linear entropy of the single qubit reduced density matrix (RDM), which can describe the mixedness, i...
National Natural Science Foundation of China(10547008)
The bipartite entanglement of the two- and three-spin Heisenberg model was investigated by using the concept of negativity. It is found that for the ground-state entanglement of the two-spin model, the negativity alwa...
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).
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 ent...