Separating the output ports of a Bragg interferometer via velocity selective transport

TL;DR

This paper introduces a velocity-selective Bloch separator in a two-photon Bragg interferometer to enhance spatial separation of output ports, thereby increasing measurement duration and sensitivity for gravity sensing.

Contribution

The study demonstrates a novel velocity-selective transport method using Bloch oscillations to improve interferometer performance and measurement sensitivity.

Findings

Enhanced spatial separation of output ports by 30 Bloch oscillations.

Increased interferometer duration reduces detection time.

Improved sensitivity to gravity acceleration and gradients.

Abstract

We report on the study of a detection scheme based on a Bloch separator in two-photon Bragg interferometers. We increase the spatial separation between the two output ports of the interferometer by selectively imparting 30 Bloch oscillations to one of them before their detection via time of flight. This method allows increasing the duration of the interferometer by reducing the time for discriminating the ports of the interferometer at detection. We study in detail the impact of this separator on the performance of a dual gravity sensor, and in particular on its measurement sensitivities to gravity acceleration and gravity gradients.