Demonstration of the Jaynes-Cummings ladder with Rydberg-dressed atoms

TL;DR

This paper experimentally demonstrates the nonlinearity of the Jaynes-Cummings ladder using Rydberg-dressed atoms, showing the isomorphism with the JC model through spectroscopic measurements of normal-mode splitting.

Contribution

It provides the first experimental observation of the JC ladder nonlinearity in a Rydberg-dressed two-atom system, establishing a new platform for quantum optics studies.

Findings

Measured normal-mode splitting as a function of detuning and Rabi frequency

Observed the $\

nonlinearity consistent with the JC model,

Abstract

We observe the nonlinearity of the Jaynes-Cummings (JC) ladder in the Autler-Townes spectroscopy of the hyperfine ground states for a Rydberg-dressed two-atom system. Here the role of the two-level system in the JC model is played by the presence or absence of a collective Rydberg excitation, and the bosonic mode manifests as the number $n$ of single atom spin flips, symmetrically distributed between the atoms. We measure the normal-mode splitting and $\sqrt{n}$ nonlinearity as a function of detuning and Rabi frequency, thereby experimentally establishing the isomorphism with the JC model.