Laser cooling and control of excitations in superfluid helium

@article{Harris2016LaserCA,
  title={Laser cooling and control of excitations in superfluid helium},
  author={Glen I Harris and David L. McAuslan and Eoin Sheridan and Yauhen P. Sachkou and Christophe Baker and Warwick Paul Bowen},
  journal={Nature Physics},
  year={2016},
  volume={12},
  pages={788-793}
}
It takes extreme sensitivity to measure the elementary excitations in liquid helium-4. An optomechanical cavity with a thin film of superfluid inside can be used to both observe and control phonons in real time. 
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