The study of random vorticity in quantum fluids through interference fluctuations

TL;DR

This paper investigates vortex dynamics in quantum Bose gases by analyzing interference fluctuation patterns, revealing how interactions influence vortex proliferation and correlation times, with implications for quantum fluid experiments.

Contribution

It introduces a numerical and analytical study of vortex-induced interference fluctuations in interacting and noninteracting Bose gases, highlighting the role of vortices in quantum fluid behavior.

Findings

Interacting Bose gases show long correlation times in interference fluctuations.

Noninteracting gases exhibit different fluctuation behavior, described analytically.

Vortex proliferation affects the observability of interference patterns in quantum fluids.

Abstract

We study the vortex dynamics of a quantum degenerate Bose gas through the intensity fluctuations of the interference from particles extracted at two different positions. It is shown numerically with classical field simulations that an interacting Bose gas with proliferating vortices exhibits long correlation times for these intensity fluctuations. This behavior is contrasted with the case of a noninteracting gas, that we describe analytically, and with the case of a well condensed Bose gas without vortices. We discuss the observability of our predictions in quantum fluids of exciton-polaritons.