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Multimode optomechanical system in the quantum regime.

William Hvidtfelt Padkær Nielsen1, Yeghishe Tsaturyan1, Christoffer Bo Møller1

  • 1Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark.

Proceedings of the National Academy of Sciences of the United States of America
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Summary
This summary is machine-generated.

Researchers developed a robust optomechanical system with many long-lived mechanical modes. This system demonstrates quantum correlations and ponderomotive squeezing, paving the way for multimode entanglement.

Keywords:
multimodeoptomechanicsquantum correlations

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Area of Science:

  • Quantum physics
  • Optomechanics
  • Materials science

Background:

  • Optomechanical systems are crucial for quantum technologies.
  • Achieving quantum regime requires overcoming thermal noise and decoherence.
  • Previous systems often lacked sufficient mechanical modes or long lifetimes.

Purpose of the Study:

  • To create a simple and robust optomechanical system with numerous long-lived mechanical modes.
  • To achieve strong optomechanical quantum correlations and quantum measurement backaction.
  • To explore the potential for multimode entanglement.

Main Methods:

  • Utilizing a phononic-bandgap shielded membrane resonator.
  • Employing a compact Fabry-Perot resonator for optical mode detection.
  • Operating at moderate cryogenic temperatures (10 K) with high measurement rates (96 kHz).

Main Results:

  • Realization of a system with mechanical modes exhibiting quality factors (Q) exceeding 10^7.
  • Observation of quantum measurement backaction surpassing thermal forces.
  • Demonstration of ponderomotive squeezing with up to -2.4 dB noise suppression (uncorrected).
  • Measurement bandwidths up to approximately 90 kHz.

Conclusions:

  • The developed system operates in the quantum regime, showing strong optomechanical correlations.
  • The multimode nature enables potential for entanglement involving electromagnetic, mechanical, and spin degrees of freedom.
  • This work advances the development of quantum devices and sensors.