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Q: Fachverband Quantenoptik und Photonik

Q 55: Optomechanics

Q 55.7: Vortrag

Donnerstag, 5. März 2026, 16:00–16:15, P 2

Tunable light induced dipole-dipole interactions — •Livia Egyed¹, Manual Reisenbauer¹, Henning Rudolph³, Murad Abuzarli², Klaus Hornberger³, Anton Zasedatelev⁵, Benjamin Stickler⁴, and Uros Delic¹ — ¹Atominstitut, Technische Universität Wien, A-1020 Vienna, Austria — ²Vienna Center for Quantum Science and Technology (VCQ), Faculty of Physics, University of Vienna, A-1090 Vienna, Austria — ³Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany — ⁴Institute for Complex Quantum Systems, Ulm University, D-89069 Ulm, Germany — ⁵Department of Applied Physics, Aalto University School of Science, FI-00076 Espoo, Finland

Tweezer arrays can be used to trap, arrange, and control atoms or dielectric nanoparticles, while ensuring strong environmental isolation. Our platform of programmable arrays of levitated nanoparticles with highly tunable optical interactions provide access to a wide range of system parameters, enabling us to adjust the coupling between the particles from fully reciprocal to uni-directional and up until fully anti-reciprocal by modifying their trapping fields. In case of anti-reciprocal coupling, we observe PT-symmetry breaking, and for strong coupling rates the system transitions into a mechanical lasing phase. Furthermore, dynamically modulating the trapping potential of particles with non-degenerate mechanical frequencies allows us to engineer an arbitrary combination of beamsplitter and two-mode squeezing type interactions between them.

Keywords: Optical levitation; Non-Hermitian; Trap array; optical coupling; Non-reciprocal