[1] Nielsen M A and Chuang I L 2000 Quantum Computation
and Quantum Information (Cambridge: Cambridge University Press)

[2] Wang G and Ying M 2006 e-print arXiv:quant-ph/0608235

[3] Ahnert S E and Payne M C 2005 Phys. Rev. A 71
012330

[4] Ahnert S E and Payne M C 2004 Phys. Rev. A 69
012312

[5] Han Y et al 2008 Chin. Phys. Lett. 25 4195

[6] Chen P X, Bergou J A, Zhu S Y and Guo G C 2007 Phys.
Rev. A 76 060303

[7] Andersson E et al 2008 Phys. Rev. A 77
052104

[8] Franke-Arnold S et al 2001 Phys. Rev. A 63
052301

[9] Peres A 1988 Phys. Lett. A 128 19

[10] Ekert A K, Huttner B, Palma G M and Peres A 1994
Phys. Rev. A 50 1047

[11] Brandt H E et al 1997 Phys. Rev. A 56 4456

[12] Ling A, Soh K P, Lamas-Linares A and Kurtsiefer C 2006
Phys. Rev. A 74 022309