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Fast long-distance transport of cold cesium atoms

Shortening experimental cycle times in order to increase the data rate of quantum simulators is an important task. In this work, we report on fast optical transport of cold atoms, which enbales fast cycle teims despite a more complex two-chamber vacuum system, where the science chamber is spatially separated from the cooling chamber for better optical access and vacuum conditions.

Transporting cold atoms between distant sections of a vacuum system is a central ingredient in many quantum simulation experiments, in particular in setups, where a large optical access and precise control over magnetic fields is needed. In this work, we demonstrate optical transport of cold cesium atoms over a total transfer distance of about 43cm in less than 30ms. The high speed is facilitated by a moving lattice, which is generated via the interference of a Bessel and a Gaussian laser beam. We transport about 3×106 atoms at a temperature of a few μK with a transport efficiency of about 75%. We provide a detailed study of the transport efficiency for different accelerations and lattice depths and find that the transport efficiency is mainly limited by the potential depth along the direction of gravity. To highlight the suitability of the optical-transport setup for quantum simulation experiments, we demonstrate the generation of a pure Bose-Einstein condensate with about 2×104 atoms. We find a robust final atom number within 2% over a duration of 2.5h with a standard deviation of <5% between individual experimental realizations.

Original publication:

Fast long-distance transport of cold cesium atoms
Till Klostermann, Cesar R. Cabrera, Hendrik von Raven, Julian F. Wienand, Christian Schweizer, Immanuel Bloch, and Monika Aidelsburger
Phys. Rev. A 105, 043319