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Efficient transport and harvesting of excitation energy under low lightconditions is an important process in nature and quantum technologies alike.Here we formulate a quantum optics perspective to excitation energy transportin configurations of two-level quantum emitters with a particular emphasis onefficiency and robustness against disorder. We study a periodic geometry ofemitter rings with subwavelength spacing, where collective electronic statesemerge due to near-field dipole-dipole interactions. The system gives rise tocollective subradiant states that are particularly suited to excitationtransport and are protected from energy disorder and radiative decoherence.Comparing ring geometries with other configurations shows that that the formerare more efficient in absorbing, transporting, and trapping incident light.Because our findings are agnostic as to the specific choice of quantumemitters, they indicate general design principles for quantum technologies withsuperior photon transport properties and may elucidate potential mechanismsresulting in the highly efficient energy transport efficiencies in naturallight-harvesting systems.

Harnessing quantum emitter rings for efficient energy transport and trapping