| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 |
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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.
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Received: 25 September 2011
Revised: 27 April 2012
Accepted manuscript online:
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PACS:
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42.50.Md
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(Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)
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32.80.Wr
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(Other multiphoton processes)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 1097602/A06). |
Cite this article:
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 2012 Chin. Phys. B 21 054210
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