Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 24: Poster II

Q 24.42: Poster

Tuesday, March 12, 2024, 17:00–19:00, KG I Foyer

Interfacing electromechanical oscillators and Rydberg atoms in a closed-cycle cryostat — •Leon Sadowski, Cedric Wind, Johanna Popp, Julia Gamper, Valerie Mauth, Wolfgang Alt, Hannes Busche, and Sebastian Hofferberth — Institute of Applied Physics, University of Bonn, Germany

Rydberg atoms exhibit strong electric dipole transitions between Rydberg states, which allow coupling to other quantum systems at microwave frequencies. Here, we present the prospect to couple Rydberg atoms to electromechanical oscillators, which can possess high Q factors at microwave frequencies, and our implementation of a cryogenic cold atom setup for such experiments.

On this poster, we present our progress on the construction of the experimental setup that is centered around an UHV closed-cycle cryostat that allows to perform experiments in a 4 K environment and includes a vibration-isolation system that reduces vibrations below 25 nm. Moreover, we show our design of a chip on which we integrate the oscillator and a superconducting wire trap that allows for magnetic trapping of Rubidium atoms above the oscillator at distances of several 10 μm. For the oscillator, we perform finite element simulations of the field radiated due to thermal phonons and deduce interaction strengths with Rydberg atoms of order kHz to MHz if the oscillator is near its quantum ground state.

In summary, the 4 K environment combined with dissipative interactions with Rydberg atoms should enable cooling the oscillator to its ground state without the need of a dilution refrigerator.

Keywords: Rydberg Atoms; Hybrid Systems; Electromechanical Oscillator; Magnetic Trapping; Cryostat