Level crossing in a two-photon Jaynes–Cummings model

doi:10.1088/1674-1056/21/5/054210

中国物理B ›› 2012, Vol. 21 ›› Issue (5): 54210-054210.doi: 10.1088/1674-1056/21/5/054210

Level crossing in a two-photon Jaynes–Cummings model

任学藻¹,丛红璐²,廖旭¹,黎雷¹

1. School of Science, Southwest University of Science and Technology, Mianyang 621010, China;
2. Physics Group, Beijing Jiao Tong University Haibin College, Huanghua 061100, China

收稿日期:2011-09-25 修回日期:2012-04-27 出版日期:2012-04-01 发布日期:2012-04-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 1097602/A06).

Level crossing in a two-photon Jaynes–Cummings model

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)

a. School of Science, Southwest University of Science and Technology, Mianyang 621010, China;
b. Physics Group, Beijing Jiao Tong University Haibin College, Huanghua 061100, China

Received:2011-09-25 Revised:2012-04-27 Online:2012-04-01 Published:2012-04-01
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 1097602/A06).

摘要/Abstract

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.

关键词: level crossing, fidelity, two-photon Jaynes--Cummings model

Abstract: 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.

Key words: level crossing, fidelity, two-photon Jaynes--Cummings model

中图分类号: (Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)

42.50.Md

32.80.Wr (Other multiphoton processes)

任学藻, 丛红璐, 廖旭, 黎雷. Level crossing in a two-photon Jaynes–Cummings model[J]. 中国物理B, 2012, 21(5): 54210-054210.

Ren Xue-Zao(任学藻), Cong Hong-Lu(丛红璐), Liao Xu(廖旭), and Li Lei(黎雷) . Level crossing in a two-photon Jaynes–Cummings model[J]. Chin. Phys. B, 2012, 21(5): 54210-054210.

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Level crossing in a two-photon Jaynes–Cummings model

Level crossing in a two-photon Jaynes–Cummings model

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