Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Ultracold Atoms and Plasmas (joint session Q/A)

Q 21.12: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

Towards hybrid quantum systems of ultracold Rydberg atoms, photonic and microwave circuits at 4 K — •Cedric Wind, Julia Gamper, Hannes Busche, and Sebastian Hofferberth — Institut für Angewandte Physik, Universität Bonn, Germany

The strong interactions of ultracold Rydberg atoms can be exploited not only for neutral atom quantum computing and simulation, but also to implement a growing toolbox of nonlinear single photon devices in Rydberg quantum optics (RQO). Following demonstrations of e.g. single photon sources, optical transistors, or quantum gates, it is our goal to bring RQO closer to practical applications by realizing networks of such devices "on-a-chip". Moreover, as Rydberg atoms couple strongly to microwaves, RQO provides a promising route towards optical read-out of superconducting qubits, e.g. in combination with electromechanical oscillators. However, unlike most experiments with ultracold Rydberg atoms to date, all these applications require cryogenic temperatures to suppress thermal noise.

Here, we present our progress towards a closed-cycle cryogenic ultracold atom apparatus that will allow us to trap and manipulate atoms near integrated photonic chips and microwave circuits. Besides reduced thermal noise, we also expect that the improved vacuum due to cryo-pumping eliminates the need to bake the system and allows for a rapid sample exchange. The cryogenic environment should also suppress blackbody-induced decay of Rydberg excitations, a major limitation in quantum simulation and information processing applications.