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

Research output: Contribution to journalArticle

Researchers

Research units

  • Aalto University
  • University of Glasgow
  • National University of Defence Technology - China

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.

Details

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

    Research areas

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

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