Entropy evolution properties in a system of two entangled atoms interacting with light field
Liu Tang-Kun (刘堂昆)ab, Wang Ji-Suo (王继锁)bc, Feng Jian (冯健)c, Zhan Ming-Sheng (詹明生)b
a Department of Physics, Hubei Normal University, Huangshi 435002, China; b State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China; c Department of Physics, Liaocheng University, Liaocheng 252059, China
Abstract In this paper, we use the field entropy as a measurement of the degree of entanglement between the light field and the atoms of the system which is composed of two dipole—dipole interacting two-level atoms initially in an entangled state interacting with the single mode coherent field in a Kerr medium. The influence of the coupling constant of dipole—dipole interaction between atoms and the coupling strength of the Kerr medium with the light field and the intensity of the light field on the field entropy are discussed by numerical calculations. It is shown that when the coupling strength of the Kerr medium with the light field is large enough, and the light field is strong, the degree of entanglement between the atoms with the light field becomes weaker. The degree of entanglement only changes slightly with the change of the coupling constant of dipole—dipole interaction between atoms.
Received: 07 April 2004
Revised: 04 August 2004
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10074072), the Scientific Research Foundation of the Ministry of Education of China (Grant No 02101), and the Higher Education Foundation of Hubei Province of China (Grant No
Cite this article:
Liu Tang-Kun (刘堂昆), Wang Ji-Suo (王继锁), Feng Jian (冯健), Zhan Ming-Sheng (詹明生) Entropy evolution properties in a system of two entangled atoms interacting with light field 2005 Chinese Physics 14 536
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