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The resonance fluorescence emitted by a system of two dipole-dipoleinteracting nearby four-level atoms in J=1/2 - J=1/2 configuration is studied.This setup is the simplest realistic model system which provides a completedescription of the (interatomic) dipole-dipole interaction for arbitraryorientation of the interatomic distance vector, and at the same time allows forintraatomic spontaneously generated coherences. We discuss different methods toanalyze the contribution of the various vacuum-induced coupling constants tothe total resonance fluorescence spectrum. These allow us to find a dressedstate interpretation of the contribution of the different interatomicdipole-dipole couplings to the total spectrum. We further study the role of thespontaneously generated coherences, and identify two different contributions tothe single-particle vacuum-induced couplings. We show that they have anoticeable impact on the total resonance fluorescence spectrum down to smallinteratomic distances, even though the dipole-dipole couplings constants thenare much larger in magnitude than the the single-particle coupling constants.Interestingly, we find that the interatomic couplings can induce an effect ofthe intraatomic spontaneously generated coherences on the observed spectrawhich is not present in single-atom systems.

Interplay of vacuum-mediated inter- and intraatomic couplings in a pair of atoms