High flux cold Rubidium atomic beam for strongly coupled Cavity QED

TL;DR

This paper describes a novel setup for generating a high-flux, continuous cold rubidium atomic beam suitable for strong coupling cavity QED experiments, achieving significant Rabi splitting and strong coupling parameters.

Contribution

The authors developed a continuous, high-flux cold rubidium beam source integrated with a cavity, enabling strong coupling in cavity QED experiments with tunable atomic velocities.

Findings

Achieved Rabi splitting of over ±10 MHz in the cavity.

Demonstrated strong coupling regime with specific parameters (g, κ, γ).

Produced a continuous atomic beam at 1.5 x 10^{10} atoms/sec.

Abstract

This paper presents a setup capable of producing a high-flux continuous beam of cold rubidium atoms for cavity QED experiments in the regime of strong coupling. A 2 $D^+$ MOT, loaded by rubidium getters in a dry film coated vapor cell, fed a secondary moving-molasses MOT (MM-MOT) at a rate of 1.5 x $10^{10}$ atoms/sec. The MM-MOT provided a continuous beam with tunable velocity. This beam was then directed through the waist of a 280 $\mu$m cavity resulting in a Rabi splitting of more than +/- 10 MHz. The presence of sufficient number of atoms in the cavity mode also enabled splitting in the polarization perpendicular to the input. The cavity was in the strong coupling regime, with parameters (g, $\kappa$, $\gamma$)/2$\pi$ equal to (7, 3, 6)/ 2$\pi$ MHz.