Observation of oscillatory Raman gain associated with two-photon Rabi oscillations of nanofiber-coupled atoms

TL;DR

This paper reports the experimental observation of oscillatory Raman gain linked to two-photon Rabi oscillations in cesium atoms coupled via a nanofiber, advancing understanding of quantum light-matter interactions.

Contribution

It demonstrates the first observation of oscillatory Raman gain associated with two-photon Rabi oscillations in a nanofiber-coupled atomic system, revealing new insights into atom-photon dynamics.

Findings

Observation of oscillatory Raman gain linked to two-photon Rabi oscillations

Dependence of Rabi frequency on system parameters studied

Detection of Autler-Townes splitting in probe transmission spectrum

Abstract

Quantum emitters with a $\Lambda$-type level structure enable numerous protocols and applications in quantum science and technology. Understanding and controlling their dynamics is, therefore, one of the central research topics in quantum optics. Here, we drive two-photon Rabi oscillations between the two ground states of cesium atoms and observe the associated oscillatory Raman gain and absorption that stems from the atom-mediated coherent photon exchange between the two drive fields. The atoms are efficiently and homogeneously coupled with the probe field by means of a nanofiber-based optical interface. We study the dependence of the two-photon Rabi frequency on the system parameters and observe Autler-Townes splitting in the probe transmission spectrum. Beyond shedding light on the fundamental processes underlying two-photon Rabi oscillations, our method could also be used to investigate (quantum) correlations between the two drive fields as well as the dynamical establishment of electromagnetically induced transparency.