Princeton University

School of Engineering & Applied Science

Solid-state rare-earth atomic ensembles for quantum information

Dr. Elizabeth Goldschmidt, US Army Research Laboratory
Bowen Hall Auditorium
Monday, January 8, 2018 - 12:30pm

I will give an overview of the emerging field of rare-earth atoms in solids as the basis for quantum memory and other tasks. These systems have a number of properties including long inherent coherence times, lack of motional dephasing or substantial spectral diffusion, and large atomic density, that make them promising systems for long-lived, efficient quantum memory. A major impediment to such a memory is the inhomogeneous broadening of the optical transition caused by site-to-site variation in the local environment. I will discuss initial results studying the effect of inhomogeneous broadening on electromagnetically induced transparency in a europium doped sample and our plans to use high-density, stoichiometric rare-earth solids for future work. Time permitting, I will shift gears and present recent results on interaction-induced dephasing in Rydberg atomic gasses. The strong, long-range, coherently-controllable interactions available with Rydberg atoms makes them an exciting platform for quantum information processing and simulation of many-body physics. However, the dense spectrum of Rydberg levels poses challenges, including the effect I will discuss in which blackbody-induced transitions between Rydberg states limit to ability to perform coherent operations with many-body Rydberg systems.