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 »

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 »

Most data in cold-atom experiments comes from images, the analysis of which is limited by our preconceptions of the patterns that could be present in the data. We focus on the well-defined case of detecting dark solitons—appearing as local density …

Machine-learning enhanced dark soliton detection in Bose–Einstein condensates Read more »

In cold atom experiments, each image of light refracted and absorbed by an atomic ensemble carries a remarkable amount of information. Numerous imaging techniques including absorption, fluorescence, and phase-contrast are commonly used. Other techniques such as off-resonance defocused imaging (ORDI, …

Multiple-camera defocus imaging of ultracold atomic gases Read more »

We quantum simulated the 2D Harper-Hofstadter (HH) lattice model in a highly elongated tube geometry—three sites in circumference—using an atomic Bose-Einstein condensate. In addition to the usual transverse (out-of-plane) magnetic flux, piercing the surface of the tube, we threaded a …

Coherence and decoherence in the Harper-Hofstadter model Read more »

Spielman group alumna Dr. Dina Genkina has composed a high level write-up of Dr. Ana Valdés-Curiel’s Rashba paper! https://jqi.umd.edu/news/researchers-comb-atoms-into-novel-swirl Topological features without a lattice in Rashba spin-orbit coupled atoms; A. Valdés-Curiel, D. Trypogeorgos, Q.-Y. Liang, R. P. Anderson, and I. …

JQI writeup of: Topological features without a lattice in Rashba spin-orbit coupled atoms Read more »

Quantum simulators are a promising technology on the spectrum of quantum devices from specialized quantum experiments to universal quantum computers. These quantum devices utilize entanglement and many-particle behavior to explore and solve hard scientific, engineering, and computational problems. Rapid development …

Quantum Simulators: Architectures and Opportunities Read more »