Mainz 2026 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Poster – Quantum Optics
Q 28.15: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 2. OG
An atomic tweezer array with strong cavity coupling — •Johannes Schabbauer1,2, Stephan Roschinski1,2, Franz von Silva-Tarouca1,2, Damien Bloch1,2, and Julian Leonard1,2 — 1Atominstutut, Vienna Center for Quantum Science and Technology (VCQ), TU Wien, Austria — 2Institute of Science and Technology Austria (ISTA), Klosterneuburg, Austria
The efficient generation of many-body entangled states is a key challenge for enabling useful quantum technologies. In some experiments with ultra-cold neutral atoms, entanglement can be created via local processes, like Rydberg or dipolar interactions. However, if one wants to efficiently create many-body states with non-local entanglement, like GHZ-states, having a process that is inherently non-local is desired. We realize this via photon-mediated interactions, by strongly coupling atoms to an optical cavity. In our experiment we achieve a very efficient light-matter interface by using a high-finesse fiber cavity with a Purcell factor of 160. For strong confinement within the cavity mode, the atoms are trapped in an array of optical tweezers. The tweezers enable site-resolved fluorescence imaging, and we use the cavity transmission for non-destructive readout of the atomic state. To control the atom-cavity coupling, we move the position of each tweezer with respect to the cavity mode. In addition, we will tune the cavity-mediated interactions of each atom individually via local lightshifts. This toolbox enables use to prepare and study many-body entanglement within the atomic array.
Keywords: Cavity; Tweezer Array; Entanglement; Quantum Simulation