Transverse azimuthal dephasing of vortex spin wave in a hot atomic gas

TL;DR

This paper investigates how the azimuthal phase difference in optical fields with orbital angular momentum causes dephasing in atomic spin waves within hot gases, with implications for quantum information processing.

Contribution

It introduces a method to study and control azimuthal dephasing of OAM spin waves in hot atomic gases, advancing understanding of light-matter interactions involving OAM.

Findings

Dephasing can be controlled by OAM charge and beam waist.

Transverse azimuthal phase difference maps onto atomic spin wave.

Results suggest potential for OAM-based quantum information applications.

Abstract

Optical fields with orbital angular momentum (OAM) interact with medium have many remarkable properties with its unique azimuthal phase, showing many potential applications in high capacity information processing, high precision measurement etc. The dephasing mechanics of optical fields with OAM in an interface between light and matter plays a vital role in many areas of physics. In this work, we study the transverse azimuthal dephasing of OAM spin wave in a hot atomic gas via OAM storage. The transverse azimuthal phase difference between the control and probe beams is mapped onto the spin wave, which essentially results in dephasing of atomic spin wave. The dephasing of OAM spin wave can be controlled by the parameters of OAM topological charge and beam waist. Our results are helpful for studying OAM light interaction with matter, maybe hold a promise in OAM-based quantum information processing.