Time-averaged adiabatic ring potential for ultracold atoms

Abstract

We report the experimental realisation of a versatile ring trap for ultracold atoms. The ring geometry is created by the time-averaged adiabatic potential resulting from the application of an oscillating magnetic bias field to a rf dressed quadrupole trap. Lifetimes for a Bose-Einstein condensate in the ring exceed 11s and the ring radius was continuously varied from 50$\mu$m to 261$\mu$m. An efficient method of loading the ring from a conventional TOP trap is presented together with a rotation scheme which introduces angular momentum into the system. The ring presents an opportunity to study the superfluid properties of a condensate in a multiply connected geometry and also has applications for matter-wave interferometry.

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• Ultracold atoms in multiple-radiofrequency dressed adiabatic potentials
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• Applying machine learning optimization methods to the production of a quantum gas
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• Trapping atoms with radio-frequency adiabatic potentials
• Shell-shaped Bose-Einstein condensates realized with dual-species mixtures
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• Atomtronic Matter-Wave Optics
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• Heisenberg-limited Sagnac Interferometer with Multi-particle States
• Nonadiabatic creation of macroscopic superpositions with strongly correlated 1D bosons on a ring trap
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• Excitation spectrum of a mixture of two Bose gases confined in a ring potential with interaction asymmetry
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