[1] Schumacher B. Quantum coding [J].Phys. Rev. A,1995,51: 2738.
[2] Chen J C,Chang A M,Melloch M F. Transition between Quantum States in a Parallel-Coupled Double Quantum Dot [J].Phys. Rev. Lett.,2004,92: 176801.
[3] Nielsen M A. Quantum information theory [D].Doctorial Dissertation of University of New Mexico,USA,1998.
[4] Loss D,Divincenzo D P. Quantum computation with quantum dots [J].Phys. Rev. A,1998,57: 120.
[5] Arnesen M C,Bose S,Vedral V. Natural thermal and Magnetic Entanglement in the 1D Heisenberg Model [J].Phys. Rev. Lett.,2001,87: 017901.
[6] Wang X G. Thermal and ground-state entanglement in Heisenberg XX qubit rings [J].Phys. Rev. A,2002,66:034302.
[7] Wang X G. Entanglement in the quantum Heisenberg XY Model [J].Phys. Rev. A,2001,64: 012313.
[8] Connor K M,William K W. Entangled rings [J].Phys. Rev. A,2001,63: 052302.
[9] Wang X G. Threshold temperature for pairwise and many-particle thermal entanglement in the isotropic Heisenberg model [J].Phys. Rev. A,2002,66: 044305 .
[10] Asoudeh M,Karimipour V. Thermal entanglement of spins in an inhomogeneous magnetic field [J].Phys. Rev.A,2005,71: 02230.
[12] William K W. Entanglement of formation of an arbitrary state of two qubits [J].Phys. Rev. Lett.,1998,80: 2245.
[13] Vidal G,Werner R F. Computable measure of entanglement [J].Phys. Rev. A,2002,65: 032314.
[14] Schliemann J. Entanglement in SU(2)-invariant quantum spin systems [J].Phys. Rev. A,2003,68: 012309.
[15] Zhang Guofeng. Some researches about quantum entanglement [D].Doctorial Dissertation of Shanxi University,2004,(in Chinese).
[16] Zhou L,Yi X X,Song H S,et al. Thermal entanglement in 1D optical lattice chains with nonlinear coupling [J].Chin. Phys.,2005,14: 1168 .
[17] Zhang G F,Li S S. Entanglement in a spin-one chain [J].Solid. S. C.,2006,138: 17.
[18] Wang X,Li H B,Sun Z,et al. Entanglement in spin-1 Heisenberg chains [J].J. Phys. A,2005,38: 8703.
[19] Zhang G F. Thermal entanglement in a two-spin-qutrit system under a non-uniform external magnetic field [OL].Quant-ph/0509014 .
[20] Sun Z,Wang X G,Li Y Q. Entanglement in dimerized and frustrated spin-one Heisenberg chains [J].New Journal of Physics,2005,83.
[21] Rossignoli R,Canosa N. Global thermal entanglement in n-qubit systems [J].Phys. Rev. A,2005,72: 012335.
[22] Tao Y J,Hu M L,Tian D P,et al. Global bipartite Entanglement in the impurity three-qubit Heisenberg XXX spin chain [J].HEP and NP,2007,31(10): 990.