Strong thermomechanical noise squeezing stabilized by feedback
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.
Authors
- Thibault Capelle (ORCID: https://orcid.org/0000-0003-2732-8332)
- Andrea Ranfagni
- Ilia Chernobrovkin (ORCID: https://orcid.org/0000-0003-0613-9049)
- Eric Langman (ORCID: https://orcid.org/0009-0008-8175-5937)
- Letizia Catalini (ORCID: https://orcid.org/0000-0001-9324-1599)
- Albert Schließer (ORCID: https://orcid.org/0000-0003-4317-5030)
- Aida Mashaal (ORCID: https://orcid.org/0000-0002-9828-6451)
- Lucio Stefan
Institutions
- University of Copenhagen (DK)
- ETH Zurich (CH)
Publication Details
- Journal
- Physical Review Research
- Published
- 2025-03-17
- DOI
- https://doi.org/10.1103/physrevresearch.7.l012071
- Citations
- 4
- Primary Topic
- Mechanical and Optical Resonators
- Type
- article
- Field-Weighted Citation Impact
- 4.99
Funders
- European Commission
- Novo Nordisk
- Danmarks Frie Forskningsfond
- Novo Nordisk Fonden
- H2020 European Research Council
- H2020 Marie Skłodowska-Curie Actions