Level crossing in a two-photon Jaynes–Cummings model

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

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.

Keywords: level crossing fidelity two-photon Jaynes--Cummings model

Received: 25 September 2011
Revised: 27 April 2012
Accepted manuscript online:

PACS:	42.50.Md	(Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)
	32.80.Wr	(Other multiphoton processes)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 1097602/A06).

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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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