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Q: Fachverband Quantenoptik und Photonik

Q 33: Cavity QED, QED, and Spin-Boson Systems I

Q 33.7: Talk

Wednesday, March 4, 2026, 16:00–16:15, P 4

An atomic tweezer array strongly coupled to a cavity — •Stephan Roschinski^{1, 2}, Johannes Schabbauer^{1, 2}, Franz von Silva-Tarouca^1,2, Damien Bloch^1,2, and Julian Léonard^1,2 — ¹TU Wien, Atominstitut, Vienna Center for Quantum Science and Technology (VCQ), Stadionallee 2, 1020 Wien, Austria — ²Institute of Science and Technology Austria (ISTA), Am Campus 1, 3400 Klosterneuburg, Austria

Quantum technologies promise efficient solutions to problems that are classically intractable. Many quantum algorithms rely on entanglement, making the deterministic generation of highly entangled states a central challenge. Although significant progress has been made across various platforms, such as Rydberg-tweezer arrays, interactions in these systems typically remain local. By contrast, truly global-range interactions can be realized by coupling atoms to a photonic mode. Here, we report on the realization of an atomic tweezer array strongly coupled to a fiber-based Fabry-Pérot cavity, achieving a Purcell factor of 160. This platform provides not only strong, cavity-mediated interactions but also precise single-atom control: the position of each atom along the cavity mode determines its coupling strength, and the cavity enables state-dependent readout. In addition, single-qubit rotations are implemented via a Raman scheme. Together, this toolbox opens the door to exploring the efficient creation of many-body entangled states.

Keywords: Cavity; Quantum Information; Tweezer array; Quantum Optics; Entanglement