Abstract
Abstract We investigate the resonance fluorescence spectrum (RFS) from a three-level Δ -configuration artificial atom, which is realized using superconducting quantum circuits (SQCs). There exists a cyclic transition structure due to the broken mirror symmetry, in which three microwave fields are simultaneously applied to drive the corresponding atomic transitions. We find that the microwave fluorescence photons can be emitted on exact one-, two- and three-photon resonance conditions. This is different from natural atom, in which the fluorescence is completely quenched due to dark-state resonance. More interestingly, it is noted that the suppression or enhancement of red (blue) sideband can be controlled by the relative phase of the applied microwave fields. The internal mechanism can be understood based on dressed-state analysis. The phase-sensitive RFS from solid-state devices may find potential application in designing all-optical switch and quantum information processing.
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