Enhancing Optomechanical Coupling via the Josephson Effect

T. T. Heikkilä, F. Massel, J. Tuorila, R. Khan, and M. A. Sillanpää
Phys. Rev. Lett. 112, 203603 – Published 23 May 2014
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Abstract

Cavity optomechanics is showing promise for studying quantum mechanics in large systems. However, the smallness of the radiation-pressure coupling is a serious hindrance. Here we show how the charge tuning of the Josephson inductance in a single-Cooper-pair transistor can be exploited to arrange a strong radiation-pressure-type coupling g0 between mechanical and microwave resonators. In a certain limit of parameters, such a coupling can also be seen as a qubit-mediated coupling of two resonators. We show that this scheme allows reaching extremely high g0. Contrary to the recent proposals for exploiting the nonlinearity of a large radiation-pressure coupling, the main nonlinearity in this setup originates from a cross-Kerr type of coupling between the resonators, where the cavity refractive index depends on the phonon number. The presence of this coupling will allow accessing the individual phonon numbers via the measurement of the cavity.

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  • Received 15 November 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.203603

© 2014 American Physical Society

Authors & Affiliations

T. T. Heikkilä1,2, F. Massel2,3, J. Tuorila4, R. Khan2, and M. A. Sillanpää2,5

  • 1Department of Physics and Nanoscience Center, University of Jyväskylä, P.O. Box 35 (YFL) FI-40014 University of Jyväskylä, Finland
  • 2Low Temperature Laboratory, Aalto University, P.O. Box 15100, FI-00076 Aalto, Finland
  • 3Department of Mathematics and Statistics, University of Helsinki, FI-00014 Helsinki, Finland
  • 4Department of Physics, University of Oulu, P.O. Box 3000, FI-90014 University of Oulu, Finland
  • 5Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Finland

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Issue

Vol. 112, Iss. 20 — 23 May 2014

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