# Readout delay free Bragg atom interferometry using overlapped spatial fringes

## TL;DR

This paper introduces a novel Bragg atom interferometry method that eliminates readout delay by overlapping spatial fringes, maintaining phase noise performance while improving measurement efficiency.

## Contribution

It presents an asymmetric Mach-Zehnder interferometer sequence that generates overlapped spatial fringes, reducing readout delay without increasing phase noise.

## Key findings

- Overlapped fringes do not increase short-term phase noise.
- The method improves measurement efficiency by eliminating readout delay.
- Noise performance is comparable to traditional schemes.

## Abstract

A method for mitigating the readout delay characteristic of Bragg-based atom interferometry is presented, utilizing an asymmetric Mach-Zehnder interferometer sequence to generate spatial fringes that are read out while still overlapped. The time of flight after the final beamsplitter is engineered to facilitate constructive overlap of the fringes on the output states. A noise analysis performed using a precision atom interferometer is presented, comparing the traditional separated symmetric scheme with that of the separated and overlapped asymmetric scheme showing no significant increase in short term phase noise.