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arXiv · 1403.7081

Observing Properties of an Interacting Homogeneous Bose--Einstein Condensate: Heisenberg-Limited Momentum Spread, Interaction Energy and Free-Expansion Dynamics

Igor Gotlibovych·Tobias F. Schmidutz·Alexander L. Gaunt·Nir Navon·Robert P. Smith·Zoran Hadzibabic
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Abstract

We study the properties of an atomic Bose--Einstein condensate produced in an optical-box potential, using high-resolution Bragg spectroscopy. For a range of box sizes, up to $70~μ$m, we directly observe Heisenberg-limited momentum uncertainty of the condensed atoms. We measure the condensate interaction energy with a precision of $k_B \times 100$ pK and study, both experimentally and numerically, the dynamics of its free expansion upon release from the box potential. All our measurements are in good agreement with theoretical expectations for a perfectly homogeneous condensate of spatial extent equal to the size of the box, which also establishes the uniformity of our optical-box system on a sub-nK energy scale.

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Igor Gotlibovych, Tobias F. Schmidutz, Alexander L. Gaunt, Nir Navon, Robert P. Smith, Zoran Hadzibabic. 2014-07-01. Observing Properties of an Interacting Homogeneous Bose--Einstein Condensate: Heisenberg-Limited Momentum Spread, Interaction Energy and Free-Expansion Dynamics. https://doi.org/10.1103/physreva.89.061604

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