Spectral Signatures of Vibronic Coupling in Trapped Cold Ionic Rydberg Systems

TL;DR

This paper investigates how vibronic coupling in trapped Rydberg ions creates hybridized states, with spectral signatures observable via RF spectroscopy, advancing understanding of quantum interactions in ion-based systems.

Contribution

It introduces the realization of a quantum Rabi model through vibronic coupling in trapped Rydberg ions and discusses how to detect this hybridization spectroscopically.

Findings

Vibronic coupling leads to distinct spectral signatures.

Hybridization can be probed by RF spectroscopy.

Signatures persist at finite temperatures and in larger ion crystals.

Abstract

Atoms and ions confined with electric and optical fields form the basis of many current quantum simulation and computing platforms. When excited to high-lying Rydberg states, long-ranged dipole interactions emerge which strongly couple the electronic and vibrational degrees of freedom through state-dependent forces. This vibronic coupling and the ensuing hybridization of internal and external degrees of freedom manifest through clear signatures in the many-body spectrum. We illustrate this by considering the case of two trapped Rydberg ions, for which the interaction between the relative vibrations and Rydberg states realizes a quantum Rabi model. We proceed to demonstrate that the aforementioned hybridization can be probed by radio frequency spectroscopy and discuss observable spectral signatures at finite temperatures and for larger ion crystals.