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Nonlinear quantum optomechanics via individual intrinsic two-level defects.

Tomás Ramos1, Vivishek Sudhir, Kai Stannigel

  • 1Institute for Theoretical Physics, University of Innsbruck, 6020 Innsbruck, Austria.

Physical Review Letters
|May 28, 2013
PubMed
Summary

We propose using natural two-level system (TLS) defect states in optomechanical devices to explore quantum phenomena with localized phonons. This approach enables strong coupling and preparation of non-classical states, even at finite temperatures.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Nanotechnology

Background:

  • Integrated optomechanical systems offer a platform for studying quantum phenomena.
  • Defect states within these systems can exhibit unique quantum properties.

Purpose of the Study:

  • To explore cavity quantum electrodynamics (QED)-like phenomena using intrinsic two-level system (TLS) defect states in optomechanical devices.
  • To investigate the interaction between TLS and mechanical resonators for quantum control.

Main Methods:

  • Utilizing intrinsic two-level system (TLS) defect states in nano-optomechanical systems.
  • Analyzing the Jaynes-Cummings-type interaction between TLS and mechanics.
  • Observing optomechanical output spectra for signatures of strong coupling.
  • Deriving expressions for temperature dependence of observed phenomena.
  • Employing microwave fields to drive TLS defects.

Main Results:

  • Achieved strong coupling regime between TLS and mechanics in existing nano-optomechanical systems.
  • Identified clear spectral signatures of this interaction in the optomechanical output.
  • Determined the temperature at which these signatures vanish.
  • Demonstrated the potential for phonon blockade via microwave driving.
  • Showcased the ability to deterministically prepare non-classical states of mechanical resonators.

Conclusions:

  • Intrinsic TLS defect states are a viable resource for cavity QED-like studies in optomechanics.
  • Strong coupling and quantum state preparation are feasible with current nano-optomechanical technology.
  • The developed methods allow for robust quantum control and exploration of fundamental physics at finite temperatures.