Collectively enhanced ground-state cooling in subwavelength atomic arrays

• URL: http://arxiv.org/abs/2405.18482v1
• Date: Tue, 28 May 2024 18:00:05 GMT
• Title: Collectively enhanced ground-state cooling in subwavelength atomic arrays
• Authors: Oriol Rubies-Bigorda, Raphael Holzinger, Ana Asenjo-Garcia, Oriol Romero-Isart, Helmut Ritsch, Stefan Ostermann, Carlos Gonzalez-Ballestero, Susanne F. Yelin, Cosimo C. Rusconi,
• Abstract summary: We present a sideband cooling scheme for atoms trapped in subwavelength arrays. We derive an effective master equation for the atomic motion by adiabatically eliminating the internal degrees of freedom of the atoms. This approach could be utilized for future quantum technologies based on dense ensembles of emitters.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Subwavelength atomic arrays in free space are becoming a leading platform for exploring emergent many-body quantum phenomena. These arrays feature strong light-induced dipole-dipole interactions, resulting in subradiant collective resonances characterized by narrowed linewidths. In this work, we present a sideband cooling scheme for atoms trapped in subwavelength arrays that utilizes these narrow collective resonances. We derive an effective master equation for the atomic motion by adiabatically eliminating the internal degrees of freedom of the atoms, and validate its prediction with numerical simulations of the full system. Our results demonstrate that subradiant resonances enable the cooling of ensembles of atoms to temperatures lower than those achievable without dipole interactions, provided the atoms have different trap frequencies. Remarkably, narrow collective resonances can be sideband-resolved even when the individual atomic transition is not. In such scenarios, ground state cooling becomes feasible solely due to light-induced dipole-dipole interactions. This approach could be utilized for future quantum technologies based on dense ensembles of emitters, and paves the way towards harnessing many-body cooperative decay for enhanced motional control.

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