# Bi-chromatic adiabatic shells for atom interferometry

## TL;DR

This paper introduces bi-chromatic adiabatic magnetic shell traps for matterwave interferometry, enabling long coherence times and high sensitivity to various fields through independent control of shell traps in Bose-Einstein Condensates.

## Contribution

It presents a novel method to create and control bi-chromatic shell traps for atom interferometry, enhancing coherence and sensitivity.

## Key findings

- Successful creation of independently controllable shell traps.
- Ability to match traps and generate a state-dependent interferometer.
- Potential for high-sensitivity imaging of electric, magnetic, or gravitational fields.

## Abstract

We demonstrate bi-chromatic adiabatic magnetic shell traps as a novel tool for matterwave interferometry. Using two strong RF fields, we dress the $|1,-1\rangle $ and $ |2,1\rangle$ states of Rubidium Bose-Einstein Condensates thus creating two independently controllable shell traps. This allows us to match the two traps and, using microwave pulses, create a state-dependent clock-type interferometer. Given the low horizontal confinement of the interferometer, the atoms can be made to spread out thus yielding a 2D sheet, which could be used in a direct imaging interferometer. This interferometer can be sensitive to spatially varying electric or magnetic fields, which could be DC, AC, RF fields or microwaves, or even local variations in gravity. We demonstrate that the trap-matching afforded by the independent control of the shell traps allows long coherence times which will result in highly sensitive imaging matterwave interferometers.