Multimode circuit optomechanics near the quantum limit

Francesco Massel, Sung Un Cho, Juha Matti Pirkkalainen, Pertti J. Hakonen, Tero T. Heikkilä, Mika A. Sillanpää

Research output: Contribution to journalArticlepeer-review

195 Citations (Scopus)

Abstract

The coupling of distinct systems underlies nearly all physical phenomena. A basic instance is that of interacting harmonic oscillators, giving rise to, for example, the phonon eigenmodes in a lattice. Of particular importance are the interactions in hybrid quantum systems, which can combine the benefits of each part in quantum technologies. Here we investigate a hybrid optomechanical system having three degrees of freedom, consisting of a microwave cavity and two micromechanical beams with closely spaced frequencies around 32ĝ€‰MHz and no direct interaction. We record the first evidence of tripartite optomechanical mixing, implying that the eigenmodes are combinations of one photonic and two phononic modes. We identify an asymmetric dark mode having a long lifetime. Simultaneously, we operate the nearly macroscopic mechanical modes close to the motional quantum ground state, down to 1.8 thermal quanta, achieved by back-action cooling. These results constitute an important advance towards engineering of entangled motional states.

Original languageEnglish
Article number987
JournalNature Communications
Volume3
DOIs
Publication statusPublished - 2012
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Physics and Astronomy

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