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Cavity optomechanics mediated by a quantum two-level system

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  • J.-M. Pirkkalainen

    (Aalto University)

  • S.U. Cho

    (Low Temperature Laboratory, Aalto University
    Present address: Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea)

  • F. Massel

    (University of Jyväskylä, Nanoscience Center, University of Jyväskylä)

  • J. Tuorila

    (University of Oulu)

  • T.T. Heikkilä

    (University of Jyväskylä, Nanoscience Center, University of Jyväskylä)

  • P.J. Hakonen

    (Low Temperature Laboratory, Aalto University)

  • M.A. Sillanpää

    (Aalto University)

Abstract

Coupling electromagnetic waves in a cavity and mechanical vibrations via the radiation pressure of photons is a promising platform for investigations of quantum–mechanical properties of motion. A drawback is that the effect of one photon tends to be tiny, and hence one of the pressing challenges is to substantially increase the interaction strength. A novel scenario is to introduce into the setup a quantum two-level system (qubit), which, besides strengthening the coupling, allows for rich physics via strongly enhanced nonlinearities. Here we present a design of cavity optomechanics in the microwave frequency regime involving a Josephson junction qubit. We demonstrate boosting of the radiation–pressure interaction by six orders of magnitude, allowing to approach the strong coupling regime. We observe nonlinear phenomena at single-photon energies, such as an enhanced damping attributed to the qubit. This work opens up nonlinear cavity optomechanics as a plausible tool for the study of quantum properties of motion.

Suggested Citation

  • J.-M. Pirkkalainen & S.U. Cho & F. Massel & J. Tuorila & T.T. Heikkilä & P.J. Hakonen & M.A. Sillanpää, 2015. "Cavity optomechanics mediated by a quantum two-level system," Nature Communications, Nature, vol. 6(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7981
    DOI: 10.1038/ncomms7981
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