Abstract
The interaction of single cw laser (coupling) field with a four-level $\ensuremath{\Lambda}$ 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 $\ensuremath{\Lambda}$ 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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