Abstract
Using the technique of stimulated Raman adiabatic passage, we propose schemes for creating arbitrary coherent superposition states of atoms in four-level systems: a Λ-type system with twofold final states and a four-level ladder system. With the use of a control field, arbitrary coherent superposition states are created without the condition of multiphoton resonance. Suitable manipulation of detunings and the control field can create either a single state or any superposition states desired.
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