Dual-species quantum degeneracy of potassium-40 and rubidium-87 on an atom chip

TL;DR

This paper reviews experiments demonstrating rapid dual quantum degeneracy of potassium-40 and rubidium-87 on an atom chip, highlighting efficient cooling techniques and progress toward integrated optical lattice systems.

Contribution

It presents a method for rapid sympathetic cooling to dual degeneracy on an atom chip, with detailed techniques for efficient BEC production and species-selective confinement.

Findings

Achieved dual quantum degeneracy in 6 seconds of evaporation.

Produced BEC of 87Rb in just 4 seconds.

Demonstrated progress toward integrating optical lattices with atom chips.

Abstract

In this article we review our recent experiments with a 40K-87Rb mixture. We demonstrate rapid sympathetic cooling of a 40K-87Rb mixture to dual quantum degeneracy on an atom chip. We also provide details on efficient BEC production, species-selective magnetic confinement, and progress toward integration of an optical lattice with an atom chip. The efficiency of our evaporation allows us to reach dual degeneracy after just 6 s of evaporation - more rapidly than in conventional magnetic traps. When optimizing evaporative cooling for efficient evaporation of 87Rb alone we achieve BEC after just 4 s of evaporation and an 8 s total cycle time.