Abstract We study the squeezing for a two-level atom in the Jaynes－Cummings model with intensity-dependent coupling using quantum information entropy, and examine the influences of the initial state of the system on the squeezed component number and direction of the information entropy squeezing. Our results show that, the squeezed component number depends on the atomic initial distribution angle, while the squeezed direction is determined by both the phases of the atom and the field for the information entropy squeezing. Quantum information entropy is shown to be a remarkable precision measure for atomic squeezing.
Received: 26 August 2002
Revised: 02 December 2002
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No 19874020), by the Natural Science Foundation of Hunan Province, China (Grant No 01JJY3030) and by the Ministry of Education, China.
Cite this article:
Li Chun-Xian (李春先), Fang Mao-Fa (方卯发) Entropy squeezing for a two-level atom in the Jaynes－Cummings model with an intensity-depend coupling 2003 Chinese Physics 12 294
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