摘要With all driving fields on Raman resonance, a tripod-type atomic system quickly evolves into a dark state decoupled from the lossy excited level. The dark state depends strongly on field Rabi frequencies, spontaneous decay rates, and the initial atomic population in a complicated way. Analytical results reveal that it is a sixfold degenerate dark state with its three components superposed both coherently and incoherently due to population redistribution from spontaneous emission.
Abstract：With all driving fields on Raman resonance, a tripod-type atomic system quickly evolves into a dark state decoupled from the lossy excited level. The dark state depends strongly on field Rabi frequencies, spontaneous decay rates, and the initial atomic population in a complicated way. Analytical results reveal that it is a sixfold degenerate dark state with its three components superposed both coherently and incoherently due to population redistribution from spontaneous emission.
(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
引用本文:
WU Jin-Hui;CUI Cui-Li;BA Nuo;MA Qi-Rong;GUO Xiu-Zhen. Six-Fold Degenerate Dark States in a Four-Level Atomic System[J]. 中国物理快报, 2007, 24(2): 428-431.
WU Jin-Hui, CUI Cui-Li, BA Nuo, MA Qi-Rong, GUO Xiu-Zhen. Six-Fold Degenerate Dark States in a Four-Level Atomic System. Chin. Phys. Lett., 2007, 24(2): 428-431.
[1] Fleischhauer M, Imamoglu A and Marangos J P 2005 Rev. Mod. Phys. 77 633 [2] Bergmann K, Theuer H and Shore B W 1998 Rev.Mod. Phys. 70 1003 [3] Wu Y and Deng L 2004 Opt. Lett. 29 2064 [4] Li J H et al 2005 Chin. Phys. Lett. 22 357 [5] Li J Y et al 2005 Chin. Phys. Lett. 22 3067 [6] Fleischhauer M and Lukin M D 2000 Phys.Rev. Lett. 84 5094 [7] Liu C et al 2001 Nature 409 490 [8] Dantan A et al 2005 Phys. Rev. Lett. 95123002 [9] Arimondo E 1996 Progress in Optics XXXV(Amsterdam: Elsevier) [10] Karpati A, Kis Z and Adam P 2004 Phys. Rev. Lett. 93 193003 [11] Paspalakis E, Kylstra N J and Knight P L 2002 Phys. Rev. A 65 053808 [12] Petrosyan D and Malakyan M P 2004 Phys. Rev. A 70 023822 [13] Niu Y P, Li R X and Gong S Q 2005 Phys. Rev. A 71 043819 [14] Cohen-Tannoudji C, Dupont-Roc J and Grynberg G 1992 Atom-Photon Interactions (New York: Wiley)
2007, Vol. 24 
