Quantum Nondemolition Measurement of a Quantum Squeezed State Beyond the 3 dB 
Limit

Lei, C. U.; Weinstein, A. J.; Suh, J.; Wollman, E. E.; Kronwald, A.; Marquardt, F.; Clerk, A. A.; Schwab, K. C.

doi:10.1103/PhysRevLett.117.100801

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Quantum Nondemolition Measurement of a Quantum Squeezed State Beyond the 3 dB Limit

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Marquardt, F.
Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Lei, C. U., Weinstein, A. J., Suh, J., Wollman, E. E., Kronwald, A., Marquardt, F., et al. (2016). Quantum Nondemolition Measurement of a Quantum Squeezed State Beyond the 3 dB Limit. Physical Review Letters, 117(10): 100801. doi:10.1103/PhysRevLett.117.100801.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6E61-E

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.