Multimode circuit optomechanics near the quantum limit

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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.

Details

Original languageEnglish
Article number987
Pages (from-to)1-6
Number of pages6
JournalNature Communications
Volume3
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

    Research areas

  • cavity read-out, Duffing oscillator, Graphene, mechanical resonator, nanomechanics, NEMS

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