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We show theoretically that by applying a bichromatic electromagnetic field,the dressed states of a monochromatically driven two-level atom can be pumpedinto a coherent superposition termed as dressed-state coherent populationtrapping. Such effect can be viewed as a new doorknob to manipulate a two-levelsystem via its control over dressed-state populations. Application of thiseffect in the precision measurement of Rabi frequency, the unexpectedpopulation inversion and lasing without inversion are discussed to demonstratesuch controllability.

Coherent population trapping in a dressed two-level atom via a bichromatic field