Author: Ian Spielman

By Posted on Posted in Group News, Papers Published, RbK

Here we revisit the topic of stationary and propagating solitonic excitations in self-repulsive three-dimensional (3D) Bose–Einstein condensates by quantitatively comparing theoretical analysis and associated numerical computations with our experimental results. Motivated by numerous experimental efforts, including our own herein, we …

Dynamical instability of 3d stationary and traveling planar dark solitons Read more »

By Posted on Posted in Group News, Papers Published, RbK

Nontrivial topology in lattices is characterized by invariants—such as the Zak phase for one-dimensional (1D) lattices—derived from wave functions covering the Brillouin zone. We realize the 1D bipartite Rice-Mele (RM) lattice using ultracold 87Rb and focus on lattice configurations possessing …

Dynamically Induced Symmetry Breaking and Out-of-Equilibrium Topology in a 1D Quantum System Read more »

By Posted on Posted in Group News, Papers Published

In ultracold-atom experiments, data often comes in the form of images which suffer information loss inherent in the techniques used to prepare and measure the system. This is particularly problematic when the processes of interest are complicated, such as interactions …

Combining machine learning with physics: A framework for tracking and sorting multiple dark solitons Read more »

By Posted on Posted in ErNa, Group News, Papers Published

In the expanding universe, relativistic scalar fields are thought to be attenuated by “Hubble friction,” which results from the dilation of the underlying spacetime metric. By contrast, in a contracting universe this pseudofriction would lead to amplification. Here, we experimentally …

Accurate Determination of Hubble Attenuation and Amplification in Expanding and Contracting Cold-Atom Universes Read more »

By Posted on Posted in Group News, RbK

High-resolution imaging of ultracold atoms typically requires custom high numerical aperture (NA) optics, as is the case for quantum gas microscopy. These high NA objectives involve many optical elements, each of which contributes to loss and light scattering, making them …

Self-Bayesian aberration removal via constraints for ultracold atom microscopy Read more »

By Posted on Posted in Group News, Papers Published, Theory

The implementation of a combination of continuous weak measurement and classical feedback provides a powerful tool for controlling the evolution of quantum systems. In this paper, we investigate the potential of this approach from three perspectives. First, we consider a …

Feedback-stabilized dynamical steady states in the Bose-Hubbard model Read more »

By Posted on Posted in Group News

The University of Maryland has been tapped to lead a multi-institutional effort supported by the National Science Foundation (NSF) that is focused on developing quantum simulation devices that can understand, and thereby exploit, the rich behavior of complex quantum systems. The NSF Quantum …

Quantum leap challenge institute for robust quantum simulation: funded! Read more »