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We consider the radiative properties of a system of two identical correlatedatoms interacting with the electromagnetic field in its vacuum state in thepresence of a generic dielectric environment. We suppose that the two emittersare prepared in a symmetric or antisymmetric superposition of one ground stateand one excited state and we evaluate the transition rate to the collectiveground state, showing distinctive cooperative radiative features. Using amacroscopic quantum electrodynamics approach to describe the electromagneticfield, we first obtain an analytical expression for the decay rate of the twoentangled two-level atoms in terms of the Green's tensor of the genericexternal environment. We then investigate the emission process when both atomsare in free space and subsequently when a perfectly reflecting mirror ispresent, showing how the boundary affects the physical features of thesuperradiant and subradiant emission by the two coupled emitters. Thepossibility to control and tailor radiative processes is also discussed.

Tuning the collective decay of two entangled emitters by means of a nearby surface