In-situ equalization of single-atom loading in large-scale optical tweezers arrays

TL;DR

This paper demonstrates the creation of large, defect-free arrays of over 300 single rubidium atoms in optical tweezers at cryogenic temperatures by using in-situ power optimization to equalize trap loading probabilities.

Contribution

It introduces a method for in-situ equalization of trap loading probabilities to improve assembly efficiency of large-scale atomic arrays.

Findings

Achieved over 300 atoms in a cryogenic environment.

Attained 37% defect-free array realization rate.

Implemented closed-loop power optimization for trap loading.

Abstract

We report on the realization of large assembled arrays of more than 300 single $^{87}$Rb atoms trapped in optical tweezers in a cryogenic environment at $\sim4$~K. For arrays with $N_{\rm a}=324$ atoms, the assembly process results in defect-free arrays in $\sim37\%$ of the realizations. To achieve this high assembling efficiency, we equalize the loading probability of the traps within the array using a closed-loop optimization of the power of each optical tweezers, based on the analysis of the fluorescence time-traces of atoms loaded in the traps.