Amplifying ultraweak transitions in collective systems via quantum interference
Ni Cui, Mihai Macovei · Physical Review A · 2017
We investigate laser-induced quantum interference phenomena in superradiance processes evolving in an ensemble of initially excited $\mathrm{\ensuremath{\Lambda}}$-type closely packed three-level emitters. The lower doublet levels are pumped with a coherent laser field. Due to constructive quantum interference effects, the superradiance occurs in a much weaker atomic transition, which is not the case in the absence of the coherent driving. This result may be of visible relevance for enhancing ultraweak transitions in atomic or atomiclike systems or for high-frequency lasing effects.