Multiphoton dressing of an anharmonic superconducting many-level quantum circuit

Jochen Braumüller, Joel Cramer, Steffen Schlör, Hannes Rotzinger, Lucas Radtke, Alexander Lukashenko, Ping Yang, Sebastian T. Skacel, Sebastian Probst, Michael Marthaler, Lingzhen Guo, Alexey V. Ustinov, and Martin Weides
Phys. Rev. B 91, 054523 – Published 26 February 2015

Abstract

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.

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  • Received 22 October 2014
  • Revised 16 February 2015

DOI:https://doi.org/10.1103/PhysRevB.91.054523

©2015 American Physical Society

Authors & Affiliations

Jochen Braumüller1, Joel Cramer1, Steffen Schlör1, Hannes Rotzinger1, Lucas Radtke1, Alexander Lukashenko1, Ping Yang1, Sebastian T. Skacel1, Sebastian Probst1, Michael Marthaler2, Lingzhen Guo2, Alexey V. Ustinov1,3, and Martin Weides1

  • 1Physikalisches Institut, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
  • 2Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
  • 3National University of Science and Technology MISIS, Moscow 119049, Russia

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Issue

Vol. 91, Iss. 5 — 1 February 2015

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