# Molecular assembly of ground state cooled single atoms

## TL;DR

This paper demonstrates precise quantum control and assembly of two single atoms into a molecule using optical tweezers, achieving ground-state cooling, minimal heating during transport, and efficient molecular formation, advancing quantum simulation and information processing.

## Contribution

It introduces a method for full quantum state control of two different single atoms, including ground-state cooling, transport, merging, and molecular assembly, with high efficiency.

## Key findings

- Achieved 61% probability of both atoms in motional ground state.
- Successfully assembled a molecule from two ground-state cooled atoms.
- Demonstrated minimal heating during atom transport.

## Abstract

We demonstrate full quantum state control of two species of single atoms using optical tweezers and assemble the atoms into a molecule. Our demonstration includes 3D ground-state cooling of a single atom (Cs) in an optical tweezer, transport by several microns with minimal heating, and merging with a single Na atom. Subsequently, both atoms occupy the simultaneous motional ground state with 61(4)\% probability. This realizes a sample of exactly two co-trapped atoms near the phase-space-density limit of one, and allows for efficient stimulated-Raman transfer of a pair of atoms into a molecular bound state of the triplet electronic ground potential $a^3\Sigma^+$. The results are key steps toward coherent creation of single ultracold molecules, for future exploration of quantum simulation and quantum information processing.