[1] Kraus B and Cirac J I 2004 Phys. Rev. Lett. 92 013602

[2]Paternostro M et al %, Son W, Kim M S, Falci G and Palma G M
2004 Phys. Rev. A 70 022320

[3]Paternostro M et al %, Son W and Kim M S
2004 Phys. Rev. Lett.
92 197901

[4]Zou J et al %, Jun G L, Bin S, Jian L and Qian S L
2006 Phys. Rev. A 73 042319

[5]Lee J et al %, Paternostro M, Kim M S and Bose S
2006 Phys. Rev. Lett. 96 080501

[6]Buck B and Sukumar C V 1981 Phys. Lett. A 81 132

[7]Rybin A et al %, Miroshnichenko G, Vadeiko I and Timonen J
1999 \it J. Phys. A: Math. Gen. 32 8739

[8]Naderi M H et al % , Soltanolkotabi M and Roknizadeh R
2005 Eur.
Phy. J. D 32 397

[9]van Enk S J 1999 Phys. Rev. A 60 5095

[10]Braunstein S L and Loock P V 2005 Rev. Mod. Phys. 77 513

[11]Peng J S and Li G X 1998 Introduction to Modern Quantum
Optics (Singapore: World Scientific) chap 2

[12] Scully M O and Zubairy M S 1997 Quantum Optics
(England: Cambridge University) chap 6

[13]Hill S and Wootters W K 1997 Phys. Rev. Lett. 78 5022

[14]Wootters W K 1998 Phys. Rev. Lett. 80 2245

[15]Mi\v{sta L et al %, Filip R and Fiur\'{asek J
2002 Phys. Rev. A 65 062315

[16]McHugh D et al %, Ziman M and Bu\v{zek V
2006 Phys. Rev. A 74 042303