# Multiport Atom Interferometry for Inertial Sensing

## TL;DR

This paper introduces advanced multiport atom interferometry techniques enabling multiple phase measurements per cycle, enhancing inertial sensing sensitivity and systematic error suppression for mobile applications.

## Contribution

It presents novel multiport measurement methods, including quadrature phase detection and real-time systematic phase cancellation, improving cold-atom sensor performance in challenging environments.

## Key findings

- Increased sensitivity with quadrature phase detection under large phase uncertainty.
- Effective suppression of systematic phases on a single shot basis.
- Experimental validation of new multiport measurement techniques.

## Abstract

We present new techniques for inertial-sensing atom interferometers which produce multiple phase measurements per experimental cycle. With these techniques, we realize two types of multiport measurements, namely quadrature phase detection and real-time systematic phase cancellation, which address challenges in operating high-sensitivity cold-atom sensors in mobile and field applications. We confirm experimentally the increase in sensitivity due to quadrature phase detection in the presence of large phase uncertainty, and demonstrate suppression of systematic phases on a single shot basis.