Dual-species Optical tweezer for Rb and K atoms

TL;DR

This paper reports the development of a dual-species optical tweezer system for trapping Rb and K atoms, enabling the creation of deterministic two-species atom arrays for quantum applications.

Contribution

First demonstration of a dual-species optical tweezer for Rb and K atoms, facilitating future polar molecule array experiments.

Findings

Successfully trapped individual Rb and K atoms using 850 nm tweezer beams.

Achieved adjustable filling ratios by controlling atomic densities.

Demonstrated deterministic two-species atom array creation via post-selection.

Abstract

The optical tweezer experiment with neutral atoms is a focal topic in cold atom physics due to its significant potential in quantum computing and simulation. Here, we present the realization of a dual-species optical tweezer for both Rb and K atoms, marking the first step towards creating a polar molecule optical tweezer array. Initially, Rb and K atoms are collected using a dual magneto-optical trap (MOT) and further cooled to 7 $\mu$K for Rb and 10 $\mu$K for K. By employing 850 nm tweezer beams, we demonstrate the ability to capture individual Rb or K atoms. The filling ratios of Rb and K can be finely adjusted by controlling the atomic densities of both species. Utilizing the post-selection technique, we can create a deterministic array of two-species atoms, paving the way for future polar molecule array formation.