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Area of Science:

  • Quantum optics
  • Gravitational-wave astronomy
  • Interferometry

Background:

  • Future gravitational-wave detectors aim for 10 dB quantum noise reduction using squeezed light.
  • Previous use of squeezing technology in LIGO and Virgo yielded moderate efficiency.

Purpose of the Study:

  • To demonstrate a 10 dB sensitivity enhancement in a Michelson interferometer using squeezed light.
  • To implement and test the balanced homodyne detection scheme for future gravitational-wave detectors.
  • To explore quantum noise reduction in higher-order laser modes for thermal noise mitigation.

Main Methods:

  • Utilized squeezed states of light in the fundamental Gaussian mode.
  • Implemented a balanced homodyne detection scheme.
  • Operated the interferometer in higher-order Hermite-Gaussian modes.

Main Results:

  • Achieved a 10 dB sensitivity enhancement in a shot-noise limited tabletop Michelson interferometer.
  • Demonstrated significant quantum noise reduction using squeezed light in both fundamental and higher-order modes.
  • Successfully implemented the balanced homodyne detection scheme.

Conclusions:

  • The study represents a significant step towards achieving target quantum noise levels in future gravitational-wave detectors.
  • Advances the application of nonclassical states in higher-order modes for interferometry.
  • Shows promise for enhanced spatial resolution and multichannel sensing applications.