@article{11692,
  author = {M. Malnou and Daniel Palken and Benjamin Brubaker and Leila Vale and Gene Hilton and Konrad Lehnert},
  title = {Squeezed Vacuum Used to Accelerate the Search for a Weak Classical Signal},
  abstract = {Many experiments that interrogate fundamental theories require detectors whose sensitivities are limited by the laws of quantum mechanics. In cavity-based searches for axionic dark matter, vacuum fluctuations in the two quadratures of the cavity electromagnetic field limit the sensitivity to an axion-induced field. In an apparatus designed to partially mimic existing axion detectors, we demonstrate experimentally that such quantum limits can be overcome through the use of squeezed states. By preparing a microwave cavity in a squeezed state and measuring just the squeezed quadrature, we enhance the spectral scan rate by a factor of 2.12 ± 0.08. This enhancement is in excellent quantitative agreement with a theoretical model accounting for both imperfect squeezing and measurement.},
  year = {2019},
  journal = {Physical Review X},
  volume = {9},
  pages = {021023 },
  month = {2019-05},
  url = {https://journals.aps.org/prx/abstract/10.1103/PhysRevX.9.021023},
  doi = {10.1103/PhysRevX.9.021023},
}