Parametric Amplification and Noise Squeezing in Room Temperature Atomic Vapors.

@article{Guarrera2019ParametricAA,
  title={Parametric Amplification and Noise Squeezing in Room Temperature Atomic Vapors.},
  author={Vera Guarrera and R. Gartman and Giuseppe Bevilacqua and Giovanni Barontini and Witold Chalupczak},
  journal={Physical review letters},
  year={2019},
  volume={123 3},
  pages={
          033601
        }
}
We report on the use of parametric excitation to coherently manipulate the collective spin state of an atomic vapor at room temperature. Signatures of the parametric excitation are detected in the ground-state spin evolution. These include the excitation spectrum of the atomic coherences, which contains resonances at frequencies characteristic of the parametric process. The amplitudes of the signal quadratures show amplification and attenuation, and their noise distribution is characterized by… 
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