Interaction induced phase fluctuations in a guided atom laser

TL;DR

This paper investigates how atom-atom interactions induce phase fluctuations in a guided atom laser, quantifying their magnitude and coherence length after a localized interaction zone using Bogoliubov theory.

Contribution

It provides a theoretical analysis of interaction-induced phase fluctuations in a one-dimensional guided atom laser, focusing on the effects of localized interactions.

Findings

Phase fluctuations depend on atomic density and interaction strength.

Coherence length decreases after the interaction zone.

The magnitude of phase fluctuations can be quantitatively predicted.

Abstract

In this paper, we determine the magnitude of phase fluctuations caused by atom-atom interaction in a one-dimensional beam of bosonic atoms. We imagine that the beam is created with a large coherence length, and that interactions only act in a specific section of the beam, where the atomic density is high enough to validate a Bogoliubov treatment. The magnitude and coherence length of the ensuing phase fluctuations in the beam after the interaction zone are determined.