Single-shot reconstruction of the density profile of a dense atomic gas

Abstract

Partial transfer absorption imaging (PTAI) of ultracold atoms allows for repeated and minimally-destructive measurements of an atomic ensemble. Here, we present a reconstruction technique based on PTAI that can be used to piece together the non-uniform spatial profile of high-density atomic samples using multiple measurements. We achieved a thirty-fold increase of the effective dynamic range of our imaging, and were able to image otherwise saturated samples with unprecedented accuracy of both low-and high-density features.

Thermodynamics of dilute Bose gases: Beyond mean-field theory for binary mixtures of Bose-Einstein condensate

“…The black dot-dashed line in the main figure is the high-temperature expression (23). The inset shows Popov and HF theory as in the upper and lower panel, whereas the purple dot-dashed line corresponds to the low-temperature expansion (21).…”

“…However, in the last few years, novel experimental techniques allowing for a more precise determination of the EOS have become available. These include the box-like trapping potential [16][17][18][19], which allows to probe a homogeneous gas, as well as the development of high resolution imaging techniques [20,21]. Besides, since the experimental realization of coherent coupling [22,23] and the observation of self-bound quantum droplets [24,25], there has been a growing interest for mixtures of Bose-Einstein condensates (BECs), for which the finite-temperature behavior still remains an open question.…”