中国物理B ›› 2012, Vol. 21 ›› Issue (5): 54210-054210.doi: 10.1088/1674-1056/21/5/054210
任学藻1,丛红璐2,廖旭1,黎雷1
Ren Xue-Zao(任学藻)a)†, Cong Hong-Lu(丛红璐)b), Liao Xu(廖旭)a), and Li Lei(黎雷)a)
摘要: In this paper, the energy spectrum of the two-photon Jaynes--Cummings model (TPJCM) is calculated exactly in the non-rotating wave approximation (non-RWA), and we study the level-crossing problem by means of fidelity. A narrow peak of the fidelity is observed at the level-crossing point, which does not appear at the avoided-crossing point. Therefore fidelity is perfectly suited for detecting the level-crossing point in the energy spectrum.
中图分类号: (Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)