Efficient collisional blockade loading of single atom into a tight microtrap

TL;DR

This paper demonstrates that controlled inelastic collisions during loading can significantly increase the efficiency of trapping single atoms in microtraps, reaching up to 80%, which is crucial for quantum information and few-body physics applications.

Contribution

The authors introduce a method utilizing controlled inelastic collisions to enhance single atom loading efficiency in optical microtraps beyond previous limitations.

Findings

Loading efficiency increased from 50% to 80%.

Controlled inelastic collisions enable faster and more reliable atom loading.

Theoretical model predicts the observed dynamics.

Abstract

We show that controlled inelastic collisions can improve the single atom loading efficiency in the collisional blockade regime of optical microtraps. A collisional loss process where only one of the colliding atoms are lost, implemented during loading, enables us to kick out one of the atoms as soon as a second atom enters the optical microtrap. When this happens faster than the pair loss, which has limited the loading efficiency of previous experiments to about 50%, we experimentally observe an enhancement to 80%. A simple analytical theory predicts the loading dynamics. Our results opens up an efficient and fast route for loading individual atoms into optical tweezers and arrays of microtraps that are too tight for easy implementation of the method reported in [1,2]. The loading of tight traps with single atoms is a requirement for their applications in future experiments in quantum information processing and few-body physics.