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Normal-Mode Splitting in a Weakly Coupled Optomechanical System.

Massimiliano Rossi1,2, Nenad Kralj2, Stefano Zippilli2,3

  • 1School of Higher Studies "C. Urbani", University of Camerino, 62032 Camerino, Macerata, Italy.

Physical Review Letters
|March 16, 2018
PubMed
Summary
This summary is machine-generated.

Normal-mode splitting, a sign of strong coupling, was observed in a weakly coupled optomechanical system. This was achieved by reducing the optical cavity decay rate using phase-sensitive feedback, effectively entering the strong coupling regime.

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Area of Science:

  • Optomechanics
  • Quantum Optics
  • Cavity Quantum Electrodynamics

Background:

  • Normal-mode splitting signifies strong coupling in interacting subsystems.
  • Strong coupling occurs when energy exchange between subsystems outpaces environmental dissipation.
  • Weakly coupled systems typically do not exhibit normal-mode splitting.

Purpose of the Study:

  • To experimentally demonstrate normal-mode splitting in a weakly coupled optomechanical system.
  • To investigate the effect of phase-sensitive feedback on system coupling regimes.
  • To achieve the strong coupling regime in an optomechanical system at room temperature.

Main Methods:

  • Utilizing a phase-sensitive feedback loop to control pump field fluctuations.
  • Operating the feedback loop near its instability threshold.
  • Measuring the optomechanical system's response to altered decay rates.

Main Results:

  • Normal-mode splitting was successfully observed in the weakly coupled optomechanical system.
  • The phase-sensitive feedback effectively reduced the optical cavity decay rate.
  • The system was promoted to an effectively strong coupling regime.

Conclusions:

  • Weakly coupled optomechanical systems can exhibit normal-mode splitting under specific feedback conditions.
  • Phase-sensitive feedback offers a method to engineer coupling regimes in quantum systems.
  • This work provides a pathway to study strong coupling phenomena at room temperature.