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  • Letter
  • Open Access

Strong thermomechanical noise squeezing stabilized by feedback

Aida Mashaal1,2,*, Lucio Stefan1,2,*, Andrea Ranfagni1,2, Letizia Catalini3,4, Ilia Chernobrovkin1,2, Thibault Capelle1,2, Eric C. Langman1,2, and Albert Schliesser1,2,†

  • *These authors contributed equally to this work.
  • †Contact author: albert.schliesser@nbi.ku.dk
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Phys. Rev. Research 7, L012071 – Published 17 March, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L012071

Abstract

Squeezing the quadrature noise of a harmonic oscillator enhances its sensitivity. Stabilization of the antisqueezed quadrature can overcome the 3 dB squeezing limit by parametric modulation. Here, we apply this method to soft-clamped membrane resonators, which hold promise for both classical and quantum sensing applications. We compare piezoelectric and capacitive parametric modulation and observe thermomechanical squeezing by up to 17 and 21 dB, respectively. Finally, we provide a full quantum theory of combining this approach with quantum-limited motion measurement. We conclude that quantum squeezing is feasible at moderate cryogenic temperatures and realistic device parameters.

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Phys. Rev. Research 7, L012071– Published 17 March, 2025
  • Received 23 March 2024
  • Accepted 23 December 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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