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We show that controlled inelastic collisions can improve the single atomloading efficiency in the collisional blockade regime of optical microtraps. Acollisional 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 asa second atom enters the optical microtrap. When this happens faster than thepair loss, which has limited the loading efficiency of previous experiments toabout 50%, we experimentally observe an enhancement to 80%. A simple analyticaltheory predicts the loading dynamics. Our results opens up an efficient andfast route for loading individual atoms into optical tweezers and arrays ofmicrotraps 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 theirapplications in future experiments in quantum information processing andfew-body physics.

Efficient collisional blockade loading of single atom into a tight microtrap