Coherence-controlled stationary entanglement between two atoms embedded in a bad cavity injected with squeezed vacuum

• Autorzy: Xiang-Ping Liao , Jian-Shu Fang , Mao-Fa Fang
• Języki publikacji: EN

Abstrakty

EN

We investigate the entanglement between two atoms in an overdamped cavity injected with squeezed vacuum when these two atoms are initially prepared in coherent states. It is shown that the stationary entanglement exhibits a strong dependence on the initial state of the two atoms when the spontaneous emission rate of each atom is equal to the collective spontaneous emission rate, corresponding to the case where the two atoms are close together. It is found that the stationary entanglement of two atoms increases with decreasing effective atomic cooperativity parameter. The squeezed vacuum can enhance the entanglement of two atoms when the atoms are initially in coherent states. Valuably, this provides us with a feasible way to manipulate and control the entanglement, by changing the relative phases and the amplitudes of the polarized atoms and by varying the effective atomic cooperativity parameter of the system, even though the cavity is a bad one. When the spontaneous emission rate of each atom is not equal to the collective spontaneous emission rate, the steady-state entanglement of two atoms always maintains the same value, as the amplitudes of the polarized atoms varies. Moreover, the larger the degree of two-photon correlation, the stronger the steady-state entanglement between the atoms.

Słowa kluczowe

EN

quantum entanglement; the squeezed vacuum; coherent states; quantum control

• Czasopismo: Open Physics
• Rocznik: 2014
• Tom: 12
• Numer: 1
• Strony: 9-16

Daty

wydano

2014-01-01

online

2014-02-02

Twórcy

autor

Xiang-Ping Liao

• College of Science, Hunan University of Technology, Zhuzhou, Hunan, 412007, China,

autor

Jian-Shu Fang

• College of Science, Hunan University of Technology, Zhuzhou, Hunan, 412007, China

autor

Mao-Fa Fang

• Department of Physics and Information Science, Hunan Normal University, Changsha, 410081, Hunan, China

Bibliografia

• [1] P.W. Shor, Phys. Rev. A 52, 2493 (1995) http://dx.doi.org/10.1103/PhysRevA.52.R2493[Crossref]
• [2] D.P. Divincenzo, Science 270, 255 (1995) http://dx.doi.org/10.1126/science.270.5234.255[Crossref]
• [3] L.K. Grover, Phys. Rev. Lett. 79, 325 (1997) http://dx.doi.org/10.1103/PhysRevLett.79.325[Crossref]
• [4] J.I. Cirac, P. Zoller, Nature 404, 579 (2000) http://dx.doi.org/10.1038/35007021[Crossref]
• [5] M.A. Nielsen, I.L. Chuang, Quantum Computation and Quantum Information (Cambridge University Press, Cambridge, 2000)
• [6] D. Braun, Phys. Rev. Lett. 89, 277901 (2002) http://dx.doi.org/10.1103/PhysRevLett.89.277901[Crossref]
• [7] M.S. Kim, J. Lee, D. Ahn, P.L. Knight, Phys. Rev. A 65, 040101(R) (2002) http://dx.doi.org/10.1103/PhysRevA.65.040101[Crossref]
• [8] B. Kraus, J.I. Cirac, Phys. Rev. Lett. 92, 013602 (2004) http://dx.doi.org/10.1103/PhysRevLett.92.013602[Crossref]
• [9] S. Schneider, G.J. Milburn, Phys. Rev. A 65, 042107 (2002) http://dx.doi.org/10.1103/PhysRevA.65.042107[Crossref]
• [10] S. Maniscalco et al., Phys. Rev. Lett. 100, 090503 (2008) http://dx.doi.org/10.1103/PhysRevLett.100.090503[Crossref]
• [11] S. Das, G. S. Agarwal, J. Phys. B 42, 141003 (2009) http://dx.doi.org/10.1088/0953-4075/42/14/141003[Crossref]
• [12] Y. Li, B. Luo, H. Guo, Hong, Phys. Rev. A 84, 012316 (2011) http://dx.doi.org/10.1103/PhysRevA.84.012316[Crossref]
• [13] D. Mundarain, M. Orszag, Phys. Rev. A 79, 052333 (2009) http://dx.doi.org/10.1103/PhysRevA.79.052333[Crossref]
• [14] X.Y. Yu, J.H. Li, EPL 92, 40002 (2010) http://dx.doi.org/10.1209/0295-5075/92/40002[Crossref]
• [15] J. Li, K. Chalapat, G.S. Paraoanu, J. Low Temp. Phys. 153, 294 (2008) http://dx.doi.org/10.1007/s10909-008-9843-1[Crossref]
• [16] Y.J. Zhang, Z.X. Man, Y.J. Xia, J. Phys. B 42, 095503 (2009) http://dx.doi.org/10.1088/0953-4075/42/9/095503[Crossref]
• [17] M. Yonac, T. Yu, J.H. Eberly, J. Phys. B 40, 545 (2007) http://dx.doi.org/10.1088/0953-4075/40/9/S02[Crossref]
• [18] M. Al-Amri, G.X. Li, R. Tan, M.S. Zubairy, Phys. Rev. A 80, 022314 (2009) http://dx.doi.org/10.1103/PhysRevA.80.022314[Crossref]
• [19] L. Mazzola, S. Maniscalco, J. Piilo, K.-A. Suominen, B.M. Garraway, Phys. Rev. A 79, 042302 (2009) http://dx.doi.org/10.1103/PhysRevA.79.042302[Crossref]
• [20] S.G. Clark, A.S. Parkins, Phys. Rev. Lett. 90, 047905 (2003) http://dx.doi.org/10.1103/PhysRevLett.90.047905[Crossref]
• [21] L.M. Duan, H.J. Kimble, Phys. Rev. Lett. 90, 253601 (2003) http://dx.doi.org/10.1103/PhysRevLett.90.253601[Crossref]
• [22] M.B. Plenio, S.F. Huelga, Phys. Rev. Lett. 88, 197901 (2002) http://dx.doi.org/10.1103/PhysRevLett.88.197901[Crossref]
• [23] J.B. Xu, S.B. Li, New J. Phys. 7, 72 (2005) http://dx.doi.org/10.1088/1367-2630/7/1/072[Crossref]
• [24] V.S. Malinovsky, I.R. Sola, Phys. Rev. Lett. 93, 190502 (2004) http://dx.doi.org/10.1103/PhysRevLett.93.190502[Crossref]
• [25] T. Yu, J.H. Eberly, Phys. Rev. Lett. 93, 140404 (2004) http://dx.doi.org/10.1103/PhysRevLett.93.140404[Crossref]
• [26] Z. Fieck, R. Tanas, Phys. Rev. A 77, 054301 (2008) http://dx.doi.org/10.1103/PhysRevA.77.054301[Crossref]
• [27] X.P. Liao, Phys. Lett. A 367, 436 (2007) http://dx.doi.org/10.1016/j.physleta.2007.03.039[Crossref]
• [28] R.R. Puri, Mathematical Methods of Quantum Optics (Springer, Berlin, 2001) http://dx.doi.org/10.1007/978-3-540-44953-9[Crossref]
• [29] Z. Ficek, R. Tanas, Phys. Rep. 372, 369 (2002) http://dx.doi.org/10.1016/S0370-1573(02)00368-X[Crossref]
• [30] G.X. Li, K. Allaart, D. Lenstra, Phys. Rev. A 69, 055802 (2004) http://dx.doi.org/10.1103/PhysRevA.69.055802[Crossref]
• [31] R.H. Dicke, Phys. Rev. 93, 99 (1954) http://dx.doi.org/10.1103/PhysRev.93.99[Crossref]
• [32] R.H. Lehmberg, Phys. Rev. A 2, 883 (1970) http://dx.doi.org/10.1103/PhysRevA.2.883[Crossref]
• [33] R.H. Lehmberg, Phys. Rev. A 2, 889 (1970) http://dx.doi.org/10.1103/PhysRevA.2.889[Crossref]
• [34] V.S. Malinovsky, I.R. Sola, Phys. Rev. Lett. 93, 190502 (2004) http://dx.doi.org/10.1103/PhysRevLett.93.190502[Crossref]
• [35] J.I. Cirac, Phys. Rev. A 46, 4354 (1992) http://dx.doi.org/10.1103/PhysRevA.46.4354[Crossref]
• [36] P. Zhou, S. Swain, Phys. Rev. A 54, 2455 (1996) http://dx.doi.org/10.1103/PhysRevA.54.2455[Crossref]
• [37] G.S. Agarwal, W. Lange, H. Walther, Phys. Rev. A 48, 4555 (1993) http://dx.doi.org/10.1103/PhysRevA.48.4555[Crossref]
• [38] W.K. Wootters, Phys. Rev. Lett. 80, 2245 (1998) http://dx.doi.org/10.1103/PhysRevLett.80.2245[Crossref]
• [39] S. Hill, W.K. Wootters, Phys. Rev. Lett. 78, 5022 (1997) http://dx.doi.org/10.1103/PhysRevLett.78.5022[Crossref]

Identyfikatory

DOI

10.2478/s11534-013-0326-x