The interaction of single cw laser (coupling) field with a four-level Λ system containing two closely spaced upper levels (a and b) is studied as a means to attain quantum control. By adjusting the coupling field Rabi frequency and detuning, it is possible to create target states of a prescribed admixture of states a and b within a dressed state representation. An electromagnetically induced transparency of an additional probe beam is also studied. The four-level Λ system gives rise to generally two dark resonances for a given coupling field detuning. When the resonances are degenerate EIT is enhanced.
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Kirova et al. (2005) studied this question.
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