Localization of a Three-Level Cascade Atom via Resonant Absorption  

作　　者：沈文炳 徐俊 胡响明 

机构地区：[1]Department of Physics, Huazhong Normal University, Wuhan 430079

出　　处：《Chinese Physics Letters》2007年第9期2583-2586,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10574052.

摘　　要：We show that it is possible to localize a three-level cascade atom under the resonance condition when it passes through a standing-wave field. The localization peaks appear at the nodes of the standing-wave field, the detecting probability is 50% in the subwavelength domain, and the peaks are narrower on the resonance than the off- resonance. The absorption is the same as that in the usual two-level medium at the nodes and is greatly suppressed outside the nodes due to the Autler-Townes splitting. This is in sharp contrast to the lambda scheme, in which the localization is impossible under the same resonance condition due to the depletion of population of the initial state by the probe field at the nodes and the electromagnetically induced transparency outside the nodes.We show that it is possible to localize a three-level cascade atom under the resonance condition when it passes through a standing-wave field. The localization peaks appear at the nodes of the standing-wave field, the detecting probability is 50% in the subwavelength domain, and the peaks are narrower on the resonance than the off- resonance. The absorption is the same as that in the usual two-level medium at the nodes and is greatly suppressed outside the nodes due to the Autler-Townes splitting. This is in sharp contrast to the lambda scheme, in which the localization is impossible under the same resonance condition due to the depletion of population of the initial state by the probe field at the nodes and the electromagnetically induced transparency outside the nodes.

关 键 词：BOSE-EINSTEIN CONDENSATION QUANTUM NONDEMOLITION MEASUREMENT AUTLER-TOWNESMICROSCOPY POSITION MEASUREMENT NEUTRAL ATOMS PHASE-CONTROL SINGLE-ATOM DIFFRACTION INTERFERENCE SPECTRUM 

分 类 号：O56[理学—原子与分子物理]