Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 29: Quantum information systems

MA 29.1: Talk

Wednesday, April 3, 2019, 09:30–09:45, H53

Demonstration of coherent Light-Matter-Spin Interaction — •Marco Pfirrmann¹, Alexey V. Ustinov^1,2, and Martin Weides^1,3 — ¹Karlsruhe Institute of Technology, Karlsruhe, Germany — ²National University of Science and Technology MISIS, Moscow, Russia — ³University of Glasgow, Glasgow, UK

Cavity-magnon-polaritons, hybrid light-spin quasiparticles, are of considerable interest to implement quantum transducers and memories. Formed by two coupled harmonic subsystems, their level structure is harmonic as well. The addition of a non-linearity would increase their functionalities significantly, e.g. by adding an anharmonic component. We demonstrate such a tripartite quantum hybrid system consisting of cavity photons, qubit transitions and spin excitations. A 3D microwave cavity couples strongly to both a superconducting transmon qubit and a ferrimagnetic YIG sphere. Nearly degenerated qubit and cavity frequencies provide dressed states with a level splitting in excess of 100 MHz. The magnon is tuned into and through resonance by an external magnetic field, with an observed coupling larger than 15 MHz. Spectroscopic and time-resolved data of the collective system are demonstrated.