Strong Coupling of a Quantum Oscillator to a Flux Qubit at Its Symmetry Point

A. Fedorov, A. K. Feofanov, P. Macha, P. Forn-Díaz, C. J. P. M. Harmans, and J. E. Mooij
Phys. Rev. Lett. 105, 060503 – Published 5 August 2010

Abstract

A flux qubit biased at its symmetry point shows a minimum in the energy splitting (the gap), providing protection against flux noise. We have fabricated a qubit of which the gap can be tuned fast and have coupled this qubit strongly to an LC oscillator. We show full spectroscopy of the qubit-oscillator system and generate vacuum Rabi oscillations. When the gap is made equal to the oscillator frequency νosc we find the largest vacuum Rabi splitting of 0.1νosc. Here being at resonance coincides with the optimal coherence of the symmetry point.

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  • Received 9 April 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.060503

© 2010 The American Physical Society

Authors & Affiliations

A. Fedorov1,*, A. K. Feofanov2,1, P. Macha3,1, P. Forn-Díaz1, C. J. P. M. Harmans1, and J. E. Mooij1

  • 1Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA Delft, The Netherlands
  • 2Physikalisches Institut and DFG Center for Functional Nanostructures (CFN) Karlsruhe Institute of Technology, Wolfgang-Gaede-Straße 1, D-76131 Karlsruhe, Germany
  • 3Institute of Photonic Technology, P.O. Box 100239, D-07702 Jena, Germany

  • *Present address: Department of Physics, ETH Zurich, CH-8093, Zurich, Switzerland. fedoroar@phys.ethz.ch

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Vol. 105, Iss. 6 — 6 August 2010

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