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研究了Kerr介质中两个耦合二能级原子的纠缠演化规律, 通过concurrence计算了系统的纠缠度, 讨论了系统初态、Kerr 介质和原子之间的偶极相互作用对腔中两个原子纠缠度的影响. 结果表明: 通过适当选取Kerr介质的耦合系数和偶极相互作用强度, 可以获得固定的两原子纠缠, 并且可以提高两原子之间的纠缠, 甚至彻底消除纠缠猝死现象.
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关键词:
- 偶极相互作用 /
- Kerr介质 /
- concurrence
We have investigated the entanglement time evolution of two coupled two-level atoms in Kerr medium. Entanglement of the system is calculated by making use of concurrence. The influences of initial state, Kerr medium, and dipole-dipole coupling intensity between two atoms on the entanglement degree of the two atoms are revealed. Results show that the appropriate choice for the nonlinear coupling constant of Kerr medium and the dipole-dipole coupling intensity can improve the degree of atom-atom entanglement and eliminate the entanglement sudden death completely. We also find that invariant and stable entanglement occurs for a particular initial state.-
Keywords:
- dipole-dipole coupling intensity /
- Kerr medium /
- concurrence
[1] Kimin P, Seung W L, Hyunseok J 2012 Phys. Rev. A 86 062301
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[13] Laural J, Choi K S, Deng H, Chou C W, Kimble H J 2007 Phys. Rev. Lett. 99 180504
[14] Ficek Z, Tanas R 2006 Phys. Rev. A 74 024304
[15] Yönac M, Yu T, Eberly J H 2007 J. Phys. B 40 S45
[16] Shan C J, Liu J B, Chen T, Liu T K, Huang Y X, Li H 2010 Acta Phys. Sin. 59 6799 (in Chinese) [单传家, 刘继兵, 陈涛, 刘堂昆, 黄燕霞, 李宏 2010 59 6799]
[17] Cui C C, Xie S Y, Yang Y P 2012 Acta Phys. Sin. 61 124206 (in Chinese) [崔丛丛, 谢双媛, 羊亚平 2010 61 124206]
[18] Qi L N, Zhang S 2009 Acta Phys. Sin. 58 4630 (in Chinese) [齐琳娜, 张寿 2009 58 4630]
[19] Zheng Q, Zhang X P, Ren Z Z 2008 Chin. Phys. B 17 3553
[20] Amitabh J, Puri R R 1992 Phys. Rev. A 45 5056
[21] Wootters K 1998 Phys. Rev. Lett. 80 2248
[22] Schmidt H, Imamoğlu A 1996 Opt. Lett. 21 1936
[23] Hau L V, Harris S E, Dutton Z, Behroozi C H 1999 Nature 397 594
[24] Lukin M D, Imamoğlu A 2001 Nature 413 273
[25] Munro W J, Nemoto K, Beausoleil R G, Spiller T P 2005 Phys. Rev. A 71 033819
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[1] Kimin P, Seung W L, Hyunseok J 2012 Phys. Rev. A 86 062301
[2] He J, Ye L, Ni Z X 2008 Chin. Phys. B 17 1597
[3] Shan C J, Man Z X, Xia Y J, Liu T K 2007 Int. J. Quant. Inform. 5 335
[4] Ekert A K 1991 Phys. Rev. Lett. 67 661
[5] Zheng S B, Guo G C 2000 Phys. Rev. Lett. 85 2392
[6] Song J, Cao Z L 2005 Acta Phys. Sin. 54 696 (in Chinese) [宋军, 曹卓良 2005 54 696 ]
[7] Loss D, Divincenzo D P 1998 Phys. Rev. A 57 120
[8] Wang X G 2001 Phys. Rev. A 64 012313
[9] Huang L Y, Fang M F 2010 Chin. Phys. B 19 090318
[10] Xu Y Y, Zhou F, Zhang X L, Feng M 2010 Chin. Phys. B 19 090317
[11] Yu T, Eberly J H 2004 Phys. Rev. Lett. 93 140404
[12] Almeida M P, de Melo F, Hor-Merll M, Salles A, Walborn S P, Ribeiro P H S, Davidovich L 2007 Science 316 579
[13] Laural J, Choi K S, Deng H, Chou C W, Kimble H J 2007 Phys. Rev. Lett. 99 180504
[14] Ficek Z, Tanas R 2006 Phys. Rev. A 74 024304
[15] Yönac M, Yu T, Eberly J H 2007 J. Phys. B 40 S45
[16] Shan C J, Liu J B, Chen T, Liu T K, Huang Y X, Li H 2010 Acta Phys. Sin. 59 6799 (in Chinese) [单传家, 刘继兵, 陈涛, 刘堂昆, 黄燕霞, 李宏 2010 59 6799]
[17] Cui C C, Xie S Y, Yang Y P 2012 Acta Phys. Sin. 61 124206 (in Chinese) [崔丛丛, 谢双媛, 羊亚平 2010 61 124206]
[18] Qi L N, Zhang S 2009 Acta Phys. Sin. 58 4630 (in Chinese) [齐琳娜, 张寿 2009 58 4630]
[19] Zheng Q, Zhang X P, Ren Z Z 2008 Chin. Phys. B 17 3553
[20] Amitabh J, Puri R R 1992 Phys. Rev. A 45 5056
[21] Wootters K 1998 Phys. Rev. Lett. 80 2248
[22] Schmidt H, Imamoğlu A 1996 Opt. Lett. 21 1936
[23] Hau L V, Harris S E, Dutton Z, Behroozi C H 1999 Nature 397 594
[24] Lukin M D, Imamoğlu A 2001 Nature 413 273
[25] Munro W J, Nemoto K, Beausoleil R G, Spiller T P 2005 Phys. Rev. A 71 033819
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