Manipulating nanoscale atom-atom interactions with cavity QED

TL;DR

This paper presents a theoretical framework for controlling atom-atom interactions at the nanoscale using cavity quantum electrodynamics, enabling the creation of Fano-Feshbach resonances through dressed state manipulation.

Contribution

It introduces an adiabatic molecular dressed state formalism to generate and analyze Fano-Feshbach resonances within cavity QED systems, specifically applied to fermionic ytterbium atoms.

Findings

Resonances arise from non-adiabatic coupling near pseudo-crossings.

The formalism enables manipulation of low-energy interatomic interactions.

Model study demonstrates feasibility with $^{171}$Yb atoms.

Abstract

We theoretically explore manipulation of interactions between excited and ground state atoms at nanoscale separations by cavity quantum electrodynamics (CQED). We develop an adiabatic molecular dressed state formalism and show that it is possible to generate Fano-Feshbach resonances between ground and long-lived excited-state atoms inside a cavity. The resonances are shown to arise due to non-adiabatic coupling near a pseudo-crossing between the dressed state potentials. We illustrate our results with a model study using fermionic $^{171}$Yb atoms in a two-modal cavity. Our study is important for manipulation of interatomic interactions at low energy by cavity field.