[1] [1] R. Hanbury Brown and R. Q. Twiss, Nature 177, 27 (1956).

[2] [2] M. Born and E. Wolf, Principles of Optics (Cambridge University Press, Cambridge, 1999).

[3] [3] B. Cao and C. Zhang, Opt. Lett. 35, 2091 (2010).

[4] [4] G. Ying, H. Liu, Q. Wei, and S. Han, Acta Opt. Sin. (in Chinese) 29, 2786 (2009).

[5] [5] S. He, X. Shen, H. Wang, W. Gong, and S. Han, Acta Opt. Sin. (in Chinese) 30, 3332 (2010).

[6] [6] T. B. Pittman, Y. H. Shih, D. V. Strekalov, and A. V. Sergienko, Phys. Rev. A 52, R3429 (1995).

[7] [7] J. Lin and J. Cheng, Acta Opt. Sin. (in Chinese) 30, 2912 (2010).

[8] [8] G. Scarcelli, V. Berardi, and Y. Shih, Phys. Rev. Lett 96, 063602 (2006).

[9] [9] J. Liu and Y. Shih, Phys. Rev. A 79, 023819 (2009).

[10] [10] M. Zhang, Q. Wei, X. Shen, Y. Liu, H. Liu, J. Cheng, and S. Han, Phys. Rev. A. 75, 021803 (2007).

[11] [11] H. Liu and S. Han, Opt. Lett. 33, 824 (2008).

[12] [12] A. Gatti, M. Bache, D. Magatti, E. Brambilla, F. Ferri, and L. A. Lugiato, J. Mod. Opt. 53, 739 (2006).

[13] [13] Y. Cai and F. Wang, Opt. Lett. 32, 205 (2007).

[14] [14] X.-H. Chen, Q. Liu, K.-H. Luo, and L.-A.Wu, Opt. Lett. 34, 695 (2009).

[15] [15] Y. Bai and S. Han, Phys. Rev. A 76, 043828 (2007).

[16] [16] D.-Z. Cao, J. Xiong, S.-H. Zhang, L.-F. Lin, L. Gao, and K. Wang, Appl. Phys. Lett. 92, 201102 (2008).

[17] [17] I. N. Agafonov, M. V. Chekhova, T. Sh. Iskhakov, and A. N. Penin, Phys. Rev. A 77, 053801 (2008).

[18] [18] K. W. C. Chan, M. N. O'Sullivan, and R. W. Boyd, Opt. Lett. 34, 3343 (2009).

[19] [19] Goodman, Statistical Optics (Wiley-Interscience, New York, 2000).