Single Sr Atoms in Optical Tweezer Arrays for Quantum Simulation
Year: 2025
Authors: Giardini V., Guariento L., Fantini A., Storm S., Inguscio M., Catani J., Cappellini G., Gavryusev V., Fallani L.
Autors Affiliation: Univ Florence, European Lab Nonlinear Spect LENS, Via N Carrara 1, I-50019 Sesto Fiorentino, Italy; Univ Florence, Dept Phys & Astron, Via G Sansone 1, I-50019 Sesto Fiorentino, Italy; CNR, Natl Inst Opt CNR INO, Via N Carrara 1, I-50019 Sesto Fiorentino, Italy; Univ Napoli Federico II, Dept Phys Ettore Pancini, Via Cinthia 21, I-80126 Naples, Italy.
Abstract: We report on the realization of a platform for trapping and manipulating individual 88Sr atoms in optical tweezers. A first cooling stage based on a blue shielded magneto-optical trap (MOT) operating on the |1S0 >->|1P1 > transition at 461 nm enables us to trap approximately 4 x 106 atoms at a temperature of 6.8 mK. Further cooling is achieved in a narrow-line red MOT using the |1S0 >->|3P1 > intercombination transition at 689 nm, bringing 5 x 105 atoms down to 5 mu K and reaching a density of 4 x 1010 cm3. 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 50%. The trapped atoms are detected via fluorescence imaging with a fidelity of 99.986(6)%, while maintaining a survival probability of 97(2)%. The release-and-recapture measurement provides a temperature of 12.92(5)mu 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.
Journal/Review: ATOMS
Volume: 14 (1) Pages from: 1-1 to: 1-15
More Information: This project h as received funding from Consiglio Nazionale delle Ricerche (CNR) PASQUA Infrastructure, QuantERA ERA-NET Cofund in Quantum Technologies project MENTA, from the Italian Ministry of Education and Research (MUR) PRIN 2022SJCKAH HIGHEST, and, in the context of the National Recovery and Resilience Plan and Next Generation EU, from M4C2 investment 1.2 project MicroSpinEnergy (Vladislav Gavryusev).KeyWords: optical tweezer; ultracold atom; quantum simulation; Sr; magneto-optical trap; 67.85.-d; 37.10.De; 37.10.GhDOI: 10.3390/atoms14010001
