Optomechanical measurement of a millimeter-sized mechanical oscillator approaching the quantum ground state

J. T. Santos, Jian Li, J. Ilves, C. F. Ockeloen-Korppi, M. Sillanpaa*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
253 Downloads (Pure)

Abstract

Cavity optomechanics is a tool to study the interaction between light and micromechanical motion. Here we observe optomechanical physics in a truly macroscopic oscillator close to the quantum ground state. As the mechanical system, we use a mm-sized piezoelectric quartz disk oscillator. Its motion is coupled to a charge qubit which translates the piezo-induced charge into an effective radiation-pressure interaction between the disk and a microwave cavity. We measure the thermal motion of the lowest mechanical shear mode at 7 MHz down to 30 mK, corresponding to roughly 10 2 quanta in a 20 mg oscillator. We estimate that with realistic parameters, it is possible to utilize the back-action cooling by the qubit in order to control macroscopic motion by a single Cooper pair. The work opens up opportunities for macroscopic quantum experiments.

Original languageEnglish
Article number103014
Pages (from-to)1-11
Number of pages11
JournalNew Journal of Physics
Volume19
DOIs
Publication statusPublished - 12 Oct 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • optomechanics
  • superconducting qubits
  • mechanical oscillators
  • MICROMECHANICAL RESONATOR
  • CAVITY OPTOMECHANICS
  • RADIATION-PRESSURE
  • ARTIFICIAL ATOM
  • MOTION
  • CIRCUIT
  • ELECTRODYNAMICS
  • MICROMIRROR
  • ELECTRODES
  • SYSTEM

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