Multimode circuit optomechanics near the quantum limit

Francesco Massel, Sung Un Cho, Juha-Matti Pirkkalainen, Pertti J. Hakonen, Tero T. Heikkilä and Mika A. Sillanpää ()
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Francesco Massel: Low Temperature Laboratory, Aalto University School of Science
Sung Un Cho: Low Temperature Laboratory, Aalto University School of Science
Juha-Matti Pirkkalainen: Low Temperature Laboratory, Aalto University School of Science
Pertti J. Hakonen: Low Temperature Laboratory, Aalto University School of Science
Tero T. Heikkilä: Low Temperature Laboratory, Aalto University School of Science
Mika A. Sillanpää: Low Temperature Laboratory, Aalto University School of Science

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: 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 32 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.

Date: 2012
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DOI: 10.1038/ncomms1993

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