Single Sr Atoms in Optical Tweezer Arrays for Quantum Simulation
arXiv:2510.19816 · doi:10.3390/atoms14010001
Abstract
We report on the realization of a platform for trapping and manipulating individual Sr atoms in optical tweezers. A first cooling stage based on a blue shielded magneto-optical trap (MOT) operating on the -> transition at 461 nm enables us to trap approximately atoms at a temperature of 6.8 mK. Further cooling is achieved in a narrow-line red MOT using the -> intercombination transition at 689 nm, bringing atoms down to 5 K and reaching a density of cm. Atoms are then loaded into 813 nm tweezer arrays generated by crossed acousto-optic deflectors and tightly focused onto the atoms with a high-numerical-aperture objective. Through light-assisted collision processes we achieve the collisional blockade, which leads to single-atom occupancy with a probability of about . The trapped atoms are detected via fluorescence imaging with a fidelity of , while maintaining a survival probability of . The release-and-recapture measurement provides a temperature of K for the atoms in the tweezers, and the ultra-high-vacuum environment ensures a vacuum lifetime higher than 7 min. These results demonstrate a robust alkaline-earth tweezer platform that combines efficient loading, cooling, and high-fidelity detection, providing the essential building blocks for scalable quantum simulation and quantum information processing with Sr atoms.
Version of record as published in MDPI Atoms 14 (1), 1 (2026)
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