Coherence generation and population transfer in a three-level ladder systemZhang Li-Da(张理达) a)b) , Wu Jin-Hui(吴金辉) a)b) , and Gao Jin-Yue(高锦岳) a)b) †

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In a four-level system of ultracold 87 Rb atoms, through analytical and numerical calculations we propose an efficient scheme to achieve the enhanced four-wave mixing process and demonstrate its dynamical control by various parameters such as the travel distance z, probe detuning δ and the probe pulse width τ . In particular, we find that the maximal intensity of the nonlinearly generated signal pulse can be about 80% of the initial input probe under the optimal condition. This greatly enhanced conversion efficiency occurs due to the constructive quantum interference between two different components of the generated signal pulse.

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