# Quantum Noise in Bright Soliton Matterwave Interferometry

## TL;DR

This paper investigates quantum noise effects in bright soliton matterwave interferometry, revealing that attractive interactions cause phase diffusion which impairs sensitivity, and proposes a partial mitigation scheme.

## Contribution

It models quantum dynamics of bright soliton interferometers and analyzes the impact of interactions on sensitivity, offering a scheme to partially restore performance.

## Key findings

- Attractive interactions induce quantum phase diffusion.
- Phase diffusion significantly reduces interferometric sensitivity.
- A scheme to partially mitigate quantum noise is proposed.

## Abstract

There has been considerable recent interest in matterwave interferometry with bright solitons in quantum gases with attractive interactions, for applications such as rotation sensing. We model the quantum dynamics of these systems and find that the attractive interactions required for the presence of bright solitons causes quantum phase-diffusion, which severely impairs the sensitivity. We propose a scheme that partially restores the sensitivity, but find that in the case of rotation sensing, it is still better to work in a regime with minimal interactions if possible.