Preparation of one 87Rb and one 133Cs atom in a single optical tweezer

Brooks, R. V.; Spence, S.; Guttridge, A.; Alampounti, A.; Rakonjac, A.; McArd, L. A.; Hutson, J. M.; Cornish, S. L.

Abstract

We report the preparation of exactly one 87Rb atom and one133Cs atom in the same optical tweezer as the essential first step towards the construction of a tweezer array of individually trapped 87Rb133Cs molecules. Through careful selection of the tweezer wavelengths, we show how to engineer species-selective trapping potentials suitable for high-fidelity preparation of Rb + Cs atom pairs. Using a wavelength of 814 nm to trap Rb and 938 nm to trap Cs, we achieve loading probabilities of 0.508(6) for Rb and 0.547(6) for Cs using standard red-detuned molasses cooling. Loading the traps sequentially yields exactly one Rb and one Cs atom in 28.4(6) % of experimental runs. Using a combination of an acousto-optic deflector and a piezo-controlled mirror to control the relative position of the tweezers, we merge the two tweezers, retaining the atom pair with a probability of 0.99(+0.01)(−0.02).We use this capability to study hyperfine-state-dependent collisions of Rb and Cs in the combined tweezer and compare the measured two-body loss rates with coupled-channel quantum scattering calculations.

Citation

Brooks, R. V., Spence, S., Guttridge, A., Alampounti, A., Rakonjac, A., McArd, L. A., Hutson, J. M., & Cornish, S. L. (2021). Preparation of one 87Rb and one 133Cs atom in a single optical tweezer. New Journal of Physics, 23, Article 065002. https://doi.org/10.1088/1367-2630/ac0000

• Journal Article Type: Article
• Acceptance Date: May 10, 2021
• Publication Date: 2021-06
• Deposit Date: Apr 9, 2021
• Publicly Available Date: May 20, 2021
• Journal: New Journal of Physics
• Publisher: IOP Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 23
• Article Number: 065002
• DOI: https://doi.org/10.1088/1367-2630/ac0000
• Public URL: https://durham-repository.worktribe.com/output/1250068