[1] C. H. Bennett and D. P. DiVincenze, Nature 404, 247 (2000).

[2] M. A. Nielsen, Phys. Rev. A 63, 022114 (2001).

[3] G. L. Kamta and A. F. Starace, Phys. Rev. Lett. 88, 107901 (2002).

[4] K. M. O'Connor and W. K. Wootters, Phys. Rev. A 63, 052302 (2001).

[5] L.-L. Deng and S.-L. Yan, Chin. Phys. 11, 383 (2002).

[6] Y. Yeo, Phys. Rev. A 66, 062312 (2002).

[7] J.-R. Sun, Y.-N. Wei, and F.-C. Pu, Chin. Phys. 4, 542 (1995).

[8] G. Zhang, S. Li, and J. Liang, Opt. Commun. 245, 457 (2005).

[9] L. Zhou, H. S. Song, Y. Q. Guo, and C. Li, Phys. Rev. A 68, 024301 (2003).

[10] X. Wang, Phys. Rev. A 64, 012313 (2001).

[11] D. Gunlycke, Y. M. Kendon, and V. Vedral, Phys. Rev. A 64, 042302 (2001).

[12] M. C. Arnesen, S. Bose, and V. Vedral, Phys. Rev. Lett. 87, 017901 (2001).

[13] N. Canosa and R. Rossignoli, Phys. Rev. A 69, 052306 (2004).

[14] D. V. Khveshchenko, Phys. Rev. B 68, 193307 (2003).

[15] Y.-M. Zhang and B. W. Xu, Chin. Phys. 4, 842 (1995).

[16] T. Zhang, X. Hui, and R. Yue, Acta Phys. Sin. 53, 2755 (2004).

[17] Y.-M. Shang and K.-L. Yao, Chin. Phys. 7, 864 (1998).

[18] Y. Sun, Y. Chen, and H. Chen, Phys. Rev. A 68, 044301 (2003).

[19] Y. Shao, T. Lan, and G. Lin, Acta Phys. Sin. 50, 948 (2001).

[20] Z. Dong and S. Feng, Chin. Phys. 7, 348 (1998).

[21] X. Hui, W. Chen, Q. Liu, and R. Yue, Acta Phys. Sin. 55, 3026 (2006).

[22] H. Fu, A. I. Solomon, and X. Wang, J. Phys. A 35, 4293 (2002).

[23] X. Xi, S. Hao, W. Chen, and R. Yue, Phys. Lett. A 297, 291 (2002).

[24] X. Wang, Phys. Rev. E 69, 066118 (2004).

[25] C. H. Bennett, D. P. DiVincenzo, J. A. Smolin, and W. K. Wootters, Phys. Rev. A 54, 3824 (1996).

[26] W. K. Wootters, Phys. Rev. Lett. 80, 2254 (1998).

[27] S. Hill and W. K. Wootters, Phys. Rev. Lett. 78, 5022 (1997).

[28] C. Anteneodo and A. M. C. Souza, J. Opt. B 5, 73 (2003).

[29] J. M. G. Sancho and S. F. Huelga, Phys. Rev. A 61, 042303 (2000).

[30] L. Davidovich, "Entanglement as an Observable" 2006 reported in Texas A-M University (2006).