80hk Momentum Separation with Bloch Oscillations in an Optically Guided Atom Interferometer

TL;DR

This paper demonstrates a highly sensitive atom interferometer with 80hk momentum separation using optical guiding and cooling, achieving coherence and enabling scalable high-precision measurements.

Contribution

It introduces a method for large momentum separation in a guided atom interferometer with maintained coherence, advancing scalable quantum sensing techniques.

Findings

Achieved 80hk momentum separation in a guided atom interferometer.

Observed 7% fringe visibility at high momentum separation.

Constructed a horizontal gradiometer to measure waveguide curvature.

Abstract

We demonstrate phase sensitivity in a horizontally guided, acceleration-sensitive atom interferometer with a momentum separation of 80hk between its arms. A fringe visibility of 7% is observed. Our coherent pulse sequence accelerates the cold cloud in an optical waveguide, an inherently scalable route to large momentum separation and high sensitivity. We maintain coherence at high momentum separation due to both the transverse confinement provided by the guide, and our use of optical delta-kick cooling on our cold-atom cloud. We also construct a horizontal interferometric gradiometer to measure the longitudinal curvature of our optical waveguide.