# Grating chips for quantum technologies

## TL;DR

This paper demonstrates the development of micro-fabricated grating chips capable of laser cooling and trapping large numbers of rubidium atoms, enabling compact quantum sensors and advanced magnetic sensing techniques.

## Contribution

It introduces a micro-fabricated GMOT for efficient atom cooling and trapping, and demonstrates an array of traps for future cold atom gradiometry applications.

## Key findings

- Successfully cooled 3 million atoms to 3μK
- Demonstrated magnetic trapping and Larmor precession sensing
- Implemented an array of magneto-optical traps with a single laser beam

## Abstract

We have laser cooled 3$\times10^6$ $^{87}$Rb atoms to 3$\mu$K in a micro-fabricated grating magneto-optical trap (GMOT), enabling future mass-deployment in highly accurate compact quantum sensors. We magnetically trap the atoms, and use Larmor spin precession for magnetic sensing in the vicinity of the atomic sample. Finally, we demonstrate an array of magneto-optical traps with a single laser beam, which will be utilised for future cold atom gradiometry.