| Level crossing in a two-photon Jaynes—Cummings model |
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| 引用本文： | 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. |
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| 作者姓名： | 任学藻 丛红璐 廖旭 黎雷 |
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| 作者单位： | School of Science,Southwest University of Science and Technology;Physics Group,Beijing Jiao Tong University Haibin College |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （Grant No. 1097602/A06） |
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| 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.
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| 关 键 词： | level crossing fidelity two-photon Jaynes-Cummings model |
| 收稿时间： | 2011-09-25 |
Level crossing in a two-photon Jaynes-Cummings model |
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| Ren Xue-Zao,Cong Hong-Lu,Liao Xu,Li Lei.Level crossing in a two-photon Jaynes-Cummings model[J].Chinese Physics B,2012,21(5):54210-054210. |
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| Authors: | Ren Xue-Zao Cong Hong-Lu Liao Xu Li Lei |
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| Institution: | 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 |
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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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| Keywords: | level crossing fidelity two-photon Jaynes--Cummings model |
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