Fluorescence control through vacuum induced coherences

Abstract

The resonance fluorescence of a four-level atom in J = 1/2 to J = 1/2 transition driven by two coherent fields is studied. We find that the incoherent fluorescence spectrum shows a direct indication of vacuum-induced coherence in the atomic system. We show that such coherence manifests itself via an enhancement or suppression of the spectral peaks in the $\pi$-polarized fluorescence. The effect of the relative phase of the driving fields on the spectral features is also investigated. We show that phase-dependent enhancement or suppression of the fluorescence peaks appears in the incoherent spectrum emitted along the $\sigma$ transitions. It is found that this phase dependence occurs because of the polarization-detection scheme employed for the observation of the fluorescence light. We present an analytical explanation, based on dressed-states of the atom-field system, to interpret the numerical results.

arXiv comment10 pages, 7 figures

References in corpus (8)

• Fluorescence control through multiple interference mechanisms
• Quantum interference in optical fields and atomic radiation
• Dark state suppression and narrow fluorescent feature in a laser-driven lambda atom
• Interference-induced splitting of resonances in spontaneous emission
• Interference in the resonance fluorescence of two incoherently coupled transitions
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Cited by in corpus (2)

• Squeezing in resonance fluorescence via vacuum induced coherences
• Quantum interference in the resonance fluorescence of a $J=1/2$-$J^{\prime }=1/2$ atomic system: Quantum beats, nonclassicality, and non-Gaussianity