An exact solution of evolution of the field entropy in a system of three-level cascade type atom interacting with single-mode coherent field

作者：Cong Hong-Lu; Ren Xue-Zao^*; Jiang Dao-Lai; Liao Xu

来源：Acta Physica Sinica, 2010, 59(5): 3221-3226.

• coherent-state orthogonalization expansion
• without rotating wave approximation
• field entropy

In this paper, the evolution of field entropy in the system of single-mode coherent light field interacting with a three-level cascade type atom is calculated exactly in the frame of complete quantum theory and without rotating wave approximation. The numerical results indicate that with the increases of the initial mean photon number (n) over bar and the atom-field coupling strengths u and v the mean value of the field entropy increases at first and then decreases. Therefore, the degrees of entanglement also increase at first and then decrease. The mean value of the entropy of the field decreases with the enlarging of the detuning Delta, which leads to the decrease of the degrees of entanglement.

• 出版日期2010-5
• 单位西南科技大学