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Area of Science:

  • Quantum mechanics
  • Nanotechnology
  • Mechanical engineering

Background:

  • Parametric squeezing is crucial for enhancing measurement sensitivity.
  • Conventional methods face a 3 dB limit, hindering further precision.
  • Micromechanical systems offer a platform for exploring quantum phenomena.

Purpose of the Study:

  • To introduce a single-quadrature feedback scheme to overcome the 3 dB limit in parametric squeezing.
  • To experimentally demonstrate this scheme in a micromechanical resonator.
  • To explore the potential for reducing mechanical resonator noise below quantum levels.

Main Methods:

  • Utilizing a micromechanical cantilever with a magnetic tip.
  • Employing a SQUID susceptometer for low-temperature detection.
  • Applying parametric pumping via magnetic field gradient modulation at twice the cantilever frequency.

Main Results:

  • Achieved a maximum squeezing of 11.5 dB for a sinusoidal test signal.
  • Observed 11.3 dB squeezing in thermomechanical noise.
  • Demonstrated that the squeezing factor is limited by parametric modulation strength.

Conclusions:

  • The proposed feedback scheme successfully overcomes the conventional 3 dB limit.
  • This technique allows for significant squeezing of mechanical resonator quadratures.
  • It holds potential for achieving sub-quantum noise levels without quantum-limited detectors.