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Area of Science:

  • Quantum mechanics
  • Optomechanics
  • Solid-state physics

Background:

  • Quantum measurement fundamentally alters system dynamics.
  • Squeezed light, with below-vacuum quantum fluctuations, can reduce optical read-out noise.
  • Previous demonstrations of squeezed light generation involved ultracold atoms.

Purpose of the Study:

  • To demonstrate continuous position measurement of a solid-state optomechanical system.
  • To generate squeezed light from such a system.
  • To explore applications in precision metrology.

Main Methods:

  • Fabricated a silicon microchip optomechanical system with a micromechanical resonator coupled to a nanophotonic cavity.
  • Used laser light for continuous position measurement of the resonator.
  • Employed homodyne detection to analyze the reflected light's fluctuation spectrum.

Main Results:

  • Observed 4.5% squeezing of reflected light below vacuum noise levels.
  • Squeezing was measured over a bandwidth of a few megahertz around the 28 MHz mechanical resonance frequency.
  • Demonstrated squeezing despite the mechanical resonator being in a highly excited thermal state (10^4 phonons).

Conclusions:

  • Continuous measurement in solid-state optomechanics can generate squeezed light.
  • Integrated microscale devices show potential for precision metrology.
  • Further improvements could lead to significant on-chip squeezed light generation.