Multiphoton dressing of an anharmonic superconducting many-level quantum circuit

We report on the investigation of a superconducting anharmonic multilevel circuit that is coupled to a harmonic readout resonator. We observe multiphoton transitions via virtual energy levels of our system up to the fifth excited state. The back-action of these higher-order excitations on our readou...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-02, Vol.91 (5), Article 054523
Main Authors: Braumüller, Jochen, Cramer, Joel, Schlör, Steffen, Rotzinger, Hannes, Radtke, Lucas, Lukashenko, Alexander, Yang, Ping, Skacel, Sebastian T., Probst, Sebastian, Marthaler, Michael, Guo, Lingzhen, Ustinov, Alexey V., Weides, Martin
Format: Article
Language:English
Subjects:
Anharmonicity
Circuits
Condensed matter
Dressing
Dynamical systems
Excitation
Joining
Sidebands
Superconductivity
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Summary:We report on the investigation of a superconducting anharmonic multilevel circuit that is coupled to a harmonic readout resonator. We observe multiphoton 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 multiphoton dressing within our anharmonic circuit 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.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.91.054523