Superior dark-state cooling via nonreciprocal couplings in trapped atoms

TL;DR

This paper introduces a novel dark-state cooling method using nonreciprocal couplings in trapped atoms, outperforming traditional electromagnetically-induced transparency cooling by enhancing cooling rates and efficiency.

Contribution

The study proposes a new dark-state cooling scheme leveraging nonreciprocal couplings, with practical implementations via atom-waveguide interfaces or photonic links, showing improved performance over existing methods.

Findings

Enhanced cooling rates compared to conventional methods

Identification of optimal parameter regions for better cooling

Mapping to dark-state sideband cooling with collective interactions

Abstract

Cooling the trapped atoms toward their motional ground states is key to applications of quantum simulation and quantum computation. By utilizing nonreciprocal couplings between constituent atoms, we present an intriguing dark-state cooling scheme in $\Lambda$-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.