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Related Experiment Video

Updated: Jan 20, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Quantum-Limited Measurements Using an Optical Cavity with Modulated Intrinsic Loss.

Alexander K Tagantsev1, Sergey A Fedorov2

  • 1Ioffe Physical-Technical Institute, 26 Politekhnicheskaya, 194021 Saint Petersburg, Russia and Swiss Federal Institute of Technology (EPFL), School of Engineering, Institute of Materials Science, CH-1015 Lausanne, Switzerland.

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|September 7, 2019
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Summary

This study demonstrates quantum-limited position measurements in cavity optomechanics by modulating optical loss. This approach avoids dynamical backaction and laser noise for enhanced precision.

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Area of Science:

  • Quantum physics
  • Optomechanics
  • Precision measurement

Background:

  • Cavity optomechanical systems are crucial for quantum sensing.
  • Traditional systems face limitations like dynamical backaction and noise.

Purpose of the Study:

  • To investigate a novel cavity optomechanical setup.
  • To enable quantum-limited position measurements.
  • To identify conditions for improved practical operation.

Main Methods:

  • Analysis of a cavity optomechanical setup.
  • Modulation of internal optical loss by oscillator position.
  • Formulation of conditions for quantum-limited measurements.

Main Results:

  • Quantum-limited position measurements are achievable.
  • Complete absence of dynamical backaction and optomechanical instability.
  • Rejection of classical laser noise and thermal cavity frequency fluctuations.

Conclusions:

  • The proposed setup offers significant advantages for practical optomechanical measurements.
  • Potential experimental implementations are discussed.