Permanent magnetic microtraps for ultracold atoms

TL;DR

This paper introduces two permanent magnetic micro-structures designed for creating microtraps for ultracold atoms, enabling efficient Bose-Einstein condensate manipulation and potential quantum information applications.

Contribution

It proposes and numerically analyzes novel permanent magnetic microtraps that do not require continuous external magnetic fields for trapping ultracold atoms.

Findings

Microtraps can be tuned with a bias magnetic field to control trap parameters.

Bose-Einstein condensates can be held more efficiently by gradually removing the bias field.

Microtraps can operate without external magnetic fields, enabling compact quantum devices.

Abstract

We propose and numerically study two permanent magnetic micro-structures for creating Ioffe-Pritchard microtraps. A bias magnetic field is used to vary the depth, trap frequencies and the minimum of each microtrap. After the Bose-Einstein condensation achievement, the bias magnetic field can be slowly removed to increase the trap barrier heights for more efficiently holding the Bose-Einstein condensates. Even without the external magnetic field, it is possible to hold ultracold atoms in the microtraps. These microtraps may also be useful for single atom experiments for quantum information processing due to their very high confinement.