Defect-free arbitrary-geometry assembly of mixed-species atom arrays

TL;DR

This paper demonstrates the assembly of defect-free, arbitrary-geometry mixed-species atom arrays with high filling fractions, enabling advanced quantum simulation and computation applications.

Contribution

First demonstration of 2D dual-species atom arrays with arbitrary geometries using a novel sorting algorithm for bottom-up assembly.

Findings

Achieved 0.88 and 0.89 filling fractions for two rubidium isotopes.

Successfully assembled a 6x4 dual-species atom array.

Proposed a heuristic heteronuclear algorithm for atom rearrangement.

Abstract

Optically trapped mixed-species single atom arrays with arbitrary geometries are an attractive and promising platform for various applications, because tunable quantum systems with multiple components provide extra degrees of freedom for experimental control. Here, we report the first demonstration of two-dimensional $6\times4$ dual-species atom assembly with a filling fraction of 0.88 (0.89) for $^{85}$Rb ($^{87}$Rb) atoms. This mixed-species atomic synthetic is achieved via rearranging initially randomly distributed atoms using a sorting algorithm (heuristic heteronuclear algorithm) which is proposed for bottom-up atom assembly with both user-defined geometries and two-species atom number ratios. Our fully tunable hybrid-atom system of scalable advantages is a good starting point for high-fidelity quantum logic, many-body quantum simulation and forming defect-free single molecule arrays.