[1] Braunstein S L et al 2005 Rev. Mod. Phys. 77 513

[2] DiVincenzo D P Science. 270 255

[3] Hald J et al 1999 Phys. Rev. Lett. 83 1319

[4] Zhang et al 2000 Phys. Rev. A 62 023813

[5] Silberhorn C et al 2001 Phys. Rev. Lett. 86
4267

[6] Simon C et al 2003 Phys. Rev. Lett. 91 053601

[7] Bowen W P et al 2002 Phys. Rev. Lett. 89
253601

[8] Lu X Y, Liu J B, Si L G and Yang X 2008 J. Phys. B
41 035501

[9] Yang X and Wu Y 2005 J. Opt. B 7 54

[10] Xiong H, Scully M O and Zubairy M S 2005 Phys. Rev.
Lett. 94 023601

[11] Qamar S et al 2008 Phy. Rev. A 77 062308

[12] Tan H T and Deng W W 2009 Chin. Phys. Lett.
26 094205

[13] Tan H T, Zhu S Y and Zubairy M S 2005 Phys. Rev.
Lett. 94 023601

[14] Simon R 2000 Phys. Rev. Lett. 84 2726

[15] Duan L M, Giedke G, Cirac J I and Zoller P 2000
Phys. Rev. Lett. 84 2722

[16] Scully M O 1986 Phys. Rev. A 35 452

[17] Hillery M and Zubairy M S 2006 Phy. Rev. Lett.
96 050503

[18] Krause J and Scully M O 1987 Phy. Rev. A 36
1771

[19] Peres A 1996 Phys. Rev. Lett. 77 1413

[20] Werner R F 1989 Phys. Rev. A 40 4277

[21] Scully M O and Zubairy M S 1997 Quantum Optics
(Cambridge: Cambridge University) p 421

[22] Wu Y, Wen L and Zhu Y 2003 Opt. Lett. 28 631

[23] Wu Y and Yang X 2004 Phys. Rev. A 70 053818

[24] Wu Y and Deng L 2004 Phys. Rev. Lett. 93
143904

[25] Wu Y 2005 Phys. Rev. A 71 053820