Simultaneous narrowing of the central peak and sidebands via simulation of quantum interference

Abstract

It is shown that simultaneous narrowing occurs upon the central peak and outer sidebands in the resonance fluorescence spectrum by simulating vacuum-induced quantum interference in a Λ-type three-level atomic system, where the transition dipole moments are orthogonal, the metastable states are coupled to each other via a microwave field and a laser field is applied to one dipole-allowed atomic transition. With the decrease in the ratio of the laser Rabi frequency to the microwave Rabi frequency, the fluorescence spectrum eventually reverts to an ultrasharp triplet. The physical interpretation of the spectral characteristics is given in terms of dressed states.