Berlin 2015 – wissenschaftliches Programm
TT 66.2: Vortrag
Mittwoch, 18. März 2015, 15:15–15:30, H 2053
Multi-photon dressing of an anharmonic superconducting many-level quantum circuit — •Jochen Braumüller1, Joel Cramer1, Steffen Schlör1, Hannes Rotzinger1, Lucas Radtke1, Alexander Lukashenko1, Ping Yang1, Sebastian Skacel1, Sebastian Probst1, Michael Marthaler2, Lingzhen Guo2, Alexey V. Ustinov1,3, and Martin Weides1 — 1Karlsruhe Institute of Technology (KIT), Physikalisches Institut, 76131 Karlsruhe, Germany — 2Karlsruhe Institute of Technology (KIT), Institut für Theoretische Festkörperphysik, 76131 Karlsruhe, Germany — 3National University of Science and Technology MISIS, Moscow 119049, Russia
We report on the investigation of a superconducting anharmonic multi-level circuit that is coupled to a harmonic readout resonator. We observe multi-photon transitions via virtual energy levels of our system up to the fifth excited state. The back-action of these higher-order excitations on our readout device is analyzed quantitatively and demonstrated to be in accordance with theoretical expectation. By applying a strong microwave drive we achieve multi-photon dressing of our system which is dynamically coupled by a weak probe tone. The emerging higher-order Rabi sidebands and associated Autler-Townes splittings involving up to five levels of the investigated anharmonic circuit are observed. Experimental results are in good agreement with master equation simulations.