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

Brooks, R. V. and Spence, S. and Guttridge, A. and Alampounti, A. and Rakonjac, A. and McArd, L. A. and Hutson, J. M. and Cornish, S. L. (2021) 'Preparation of one 87Rb and one 133Cs atom in a single optical tweezer.', New Journal of Physics, 23 . 065002.


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.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution 3.0.
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Full text:(VoR) Version of Record
Available under License - Creative Commons Attribution 4.0.
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Publisher statement:Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Date accepted:10 May 2021
Date deposited:20 May 2021
Date of first online publication:June 2021
Date first made open access:20 May 2021

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