Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

TT 66.2: Talk

Wednesday, March 18, 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. Ustinov^1,3, 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.