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Arrays of coupled dipole emitters support collective single- and multiphotonstates that can preserve quantum excitations. One of the crucialcharacteristics of these states is the lifetime, which is fundamentally limiteddue to spontaneous emission. Here, we present a mechanism of external couplingof two states via the radiation continuum, which allows for an increase in thelifetime of both single and double excitations. As an illustrative example, weconsider a ring-like ensemble of quantum emitters, demonstrating that uponslight optimization of the structure geometry, one can increase the lifetime ofsingly and doubly excited states with non-zero orbital momentum by severalorders of magnitude.

Non-radiant multiphoton states in quantum ring oligomers