Interpertation and Origin of the sideband asymmetry of a mechanical oscillator close to the ground state

POSTER

Abstract

Cavity Optomechanics provides an unique way to probe the quantum mechanical motion of a macroscopic oscillator. Motional sideband thermometry has been shown in different measurement schemes to calibrate the phonon bath. In this experiment, we performed the motional sideband asymmetry measurement with multiple tones scheme in the optical domain for the first time. Using a heterdyne detection scheme, the output noise spectrum reveals the correlation between the imprecision and quantum backaction. Besides, we observed an effective Kerr-type optical nonlinearity due to the optical absorption heating. The finite cavity thermal response would produce artifical sideband asymmetry when the cooling tone and the red tone are close. This spurious sideband asymmetry is analyzed with a detailed theoretical model. Our measurement provided a lot of insight towards multiple tones optical measurement in cavity optomechanics, such as back-action evasion measurement and quantum mechanical squeezing.

Presenters

  • Liu Qiu

    Swiss Fed Inst Tech, Ecole Polytech Fed de Lausanne

Authors

  • Liu Qiu

    Swiss Fed Inst Tech, Ecole Polytech Fed de Lausanne

  • Itay Shomroni

    Swiss Fed Inst Tech, Ecole Polytech Fed de Lausanne

  • Nicolas Piro

    Swiss Fed Inst Tech

  • Daniel Malz

    University of Cambridge, Department of Physics, University of Cambridge, Cavendish Laboratory, University of Cambridge, Physics, University of Cambridge

  • Andreas Nunnenkamp

    University of Cambridge, Department of Physics, University of Cambridge, Cavendish Laboratory, University of Cambridge, Physics, University of Cambridge

  • Tobias Kippenberg

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne, Swiss Fed Inst Tech, Physics, EPFL, Department of Physics, Ecole Polytechnique Federale de Lausanne, Ecole Polytech Fed de Lausanne, Institute of Physics, EPFL - Lausanne​