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Fabrication and Testing of Microfluidic Optomechanical Oscillators
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Multimode circuit optomechanics near the quantum limit.

Francesco Massel1, Sung Un Cho, Juha-Matti Pirkkalainen

  • 1Low Temperature Laboratory, Aalto University School of Science, P.O. Box 15100, FI-00076 Espoo, Finland.

Nature Communications
|August 9, 2012
PubMed
Summary

Researchers observed tripartite optomechanical mixing in a hybrid quantum system. This advance in quantum technologies engineers entangled motional states using coupled photonic and phononic modes.

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Area of Science:

  • Quantum physics
  • Optomechanics
  • Hybrid quantum systems

Background:

  • Coupling of systems is fundamental to physical phenomena, exemplified by interacting harmonic oscillators and phonon modes in lattices.
  • Hybrid quantum systems merge distinct components to enhance quantum technologies.
  • Optomechanical systems couple light and mechanical motion, offering unique control and sensing capabilities.

Purpose of the Study:

  • Investigate a hybrid optomechanical system with three degrees of freedom.
  • Demonstrate tripartite optomechanical mixing for the first time.
  • Explore the creation of entangled motional states.

Main Methods:

  • Utilized a microwave cavity coupled to two micromechanical beams with closely spaced frequencies.
  • Observed tripartite optomechanical mixing, indicating hybrid photonic and phononic eigenmodes.
  • Achieved near quantum ground state operation for macroscopic mechanical modes via back-action cooling.

Main Results:

  • First evidence of tripartite optomechanical mixing recorded.
  • Identified an asymmetric dark mode with a long lifetime.
  • Operated mechanical modes near the motional quantum ground state (1.8 thermal quanta).

Conclusions:

  • The study demonstrates a novel form of light-matter interaction in a hybrid system.
  • The findings advance the engineering of quantum states for quantum technologies.
  • The observed phenomena pave the way for creating entangled mechanical states.