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Cooling the trapped atoms toward their motional ground states is key toapplications of quantum simulation and quantum computation. By utilizingnonreciprocal couplings between constituent atoms, we present an intriguingdark-state cooling scheme in $\Lambda$-type three-level structure, which isshown superior than the conventional electromagnetically-induced-transparencycooling in a single atom. The effective nonreciprocal couplings can befacilitated either by an atom-waveguide interface or a free-space photonicquantum link. By tailoring system parameters allowed in dark-state cooling, weidentify the parameter regions of better cooling performance with an enhancedcooling rate. We further demonstrate a mapping to the dark-state sidebandcooling under asymmetric laser driving fields, which shows a distinct heattransfer and promises an outperforming dark-state sideband cooling assisted bycollective spin-exchange interactions.

Superior dark-state cooling via nonreciprocal couplings in trapped atoms