Non-radiative configurations of a few quantum emitters ensembles: Evolutionary optimization approach

Abstract

Suppressing the spontaneous emission in quantum emitters ensembles (atoms) is one of the topical problems in quantum optics and quantum technology. While many approaches are based on utilizing the subradiance effect in ordered quantum emitters arrays, the ensemble configurations providing the minimal spontaneous emission rate are yet unknown. In this work, we employ the differential evolution algorithm to identify the optimal configurations of a few atomic ensembles that support quantum states with maximal radiative lifetime. We demonstrate that atoms tend to assemble mostly in quasi-regular structures with specific geometry, which strongly depends on the minimally allowed interatomic distance rmin. While the discovered specific non-radiative realizations of small ensembles cannot be immediately predicted, there is particular correspondence to the non-radiative states in the atomic lattices. In particular, we have found that states inheriting their properties either from the bound states in the continuum or band edge states of infinite lattices dominate across a wide range of rmin values. Additionally, we show that for small interatomic distances, the linear arrays with modulated spacing have the smallest radiative losses exponentially decreasing as the size of the ensemble increases.

Engineering of High-Q States via Collective Mode Coupling in Chains of Mie Resonators

“…For instance, Q -factors of more than 1000 can be reached in the structures with the longitudinal size ≲2λ (geometrical volume ≈0.15λ 3 ). We also note that although the optimized chain of nanoresonators, i.e., with varied gaps and/or heights of the cylinders, can exhibit higher Q -factors than the regular ones, the difference is rather small in the case of the small chains (4–8 nanoresonators). − The compactness and geometrical simplicity of the considered regular nanoresonator chain along with the clear insights into the physics of the loss suppression might be beneficial for the bottom-up design of the high- Q optical resonant nanostructures for Purcell enhancement and realization of strong light–matter coupling regimes.…”