Related Experiment Video
Updated: Mar 15, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Quantum Nondemolition Measurement of a Quantum Squeezed State Beyond the 3 dB Limit
C U Lei1, A J Weinstein1, J Suh2
1Applied Physics, California Institute of Technology, Pasadena, California 91125, USA.
Abstract:
We use a reservoir engineering technique based on two-tone driving to generate and stabilize a quantum squeezed state of a micron-scale mechanical oscillator in a microwave optomechanical system. Using an independent backaction-evading measurement to directly quantify the squeezing, we observe 4.7±0.9 dB of squeezing below the zero-point level surpassing the 3 dB limit of standard parametric squeezing techniques. Our measurements also reveal evidence for an additional mechanical parametric effect. The interplay between this effect and the optomechanical interaction enhances the amount of squeezing obtained in the experiment.
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