Information entropy squeezing of the atom of an arbitrary initial state via the two-photon process
Xiaojuan Liu, Zhou Bing-Ju, Mao-Fa Fang, Zhou Qing-Ping, (1)湖南科技大学物理学院，湘潭 411201; (2)湖南科技大学物理学院，湘潭 411201；湖南师范大学物理与信息学院，长沙 410081；中国科学院安徽光学精密机械研究所，合肥 230031; (3)湖南师范大学物理与信息学院，长沙 410081；中国科学院安徽光学精密机械研究所，合肥 230031 · Acta Physica Sinica · 2006
From the quantum information point of view we investigate the entropy squeezing properties of a two_level atom with arbitrary initial state interacting with the coherent field via the two_photon process. The influence of the initial state of the system on the atomic information entropy squeezing is discussed. The numerical results obtained from the uncertainly relation of quantum information entropy are compared with those obtained from the uncertainly relation of Heisenberg. It is shown that the number of squeezed component of the atomic dipole, squeezed frequency, squeezed amplitude and squeezed direction of the atomic information entropy squeezing can be controlled by choosing the initial atomic distribution angle, the atomic mixing degree and the relative phase of the field mode, respectively. Quantum information entropy is a remarkable precise measure for the atomic squeezing.