Highly resolved measurements of Stark-tuned F\"orster resonances between Rydberg atoms

TL;DR

This study uses high-resolution Ramsey interferometry to explore Stark-tuned F"orster resonances between Rydberg atoms, revealing detailed angular dependencies and interaction tunability via electric fields.

Contribution

It provides the first high-resolution measurements of Stark-tuned F"orster resonances, demonstrating control over interaction strength and angular dependence in Rydberg atom pairs.

Findings

Resolved individual F"orster resonances with high precision

Demonstrated electric field tuning of interaction strength

Measured coherence times near resonances

Abstract

We report on experiments exploring Stark-tuned F\"orster resonances between Rydberg atoms with unprecedented resolution in the F\"orster defect. The individual resonances are expected to exhibit different angular dependencies, opening the possibility to tune not only the interaction strength but also the angular dependence of the pair state potentials by an external electric field. We achieve a high resolution by optical Ramsey interferometry for Rydberg atoms combined with electric field pulses. The resonances are detected by a loss of visibility in the Ramsey fringes due to resonances in the interaction. We present measurements of the density dependence as well as of the coherence time at and close to F\"orster resonances.