中央研究院 原子與分子科學研究所

Cooling the trapped atoms toward their motional ground states is key to applications of quantum
simulation and quantum computation. By utilizing nonreciprocal couplings between two atoms,
we present an intriguing dark-state cooling scheme in Λ-type three-level structure, which is shown
superior than the conventional electromagnetically-induced-transparency cooling in a single atom.
The effective nonreciprocal couplings can be facilitated either by an atom–waveguide interface or a
free-space photonic quantum link. By tailoring system parameters allowed in dark-state cooling,
we identify the parameter regions of better cooling performance with an enhanced cooling rate.
We further demonstrate a mapping to the dark-state sideband cooling under asymmetric laser
driving fields, which shows a distinct heat transfer and promises an outperforming dark-state
sideband cooling assisted by collective spin–exchange interactions.

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