Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Superconductivity: Tunneling, Josephson Junctions, SQUIDs

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 Weides11Karlsruhe 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.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin