Quantum technology with warm, cold, and ultracold atoms

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Synopsis

Atomic systems serve as a versatile and highly controllable platform for exploring quantum systems, with opportunities to advance both fundamental understanding and technological applications. In our lab, we use rubidium-87 atoms together with a suite of optical, microwave, and radio-frequency waves to manipulate the quantum states of matter.  In one focus area within our lab, we have developed and characterized an efficient and broadband quantum memory for the storage and manipulation of photonic quantum information. We demonstrate on-demand storage and retrieval of both high-power and less-than-one-photon optical signals with total efficiencies up to 30%, using the ground state spin-wave as our storage states. We also realize a number of photonic manipulations, including temporal beamsplitting, frequency conversion, and pulse shaping.  Another focus of our lab is in developing a scheme for holonomic quantum computing, using a Bose-Einstein condensate as our medium and engineering the necessary interactions via Floquet driving in the optical and rf fields.  With carefully engineered sequences, we are able to generate holonomic gates that match the theoretically predicted evolutions, paving the way for next steps that include verifying the non-Abelian nature of the process. Finally, I will briefly discuss our work with warm atoms in high-Q microwave cavities, and how this system can lead to practical quantum technologies.