First long-term application of squeezed states of light in a gravitational-wave observatory.

@article{Grote2013FirstLA,
  title={First long-term application of squeezed states of light in a gravitational-wave observatory.},
  author={Hartmut Grote and Karsten Danzmann and K L Dooley and Roman Schnabel and Jacob Slutsky and Henning Vahlbruch},
  journal={Physical review letters},
  year={2013},
  volume={110 18},
  pages={
          181101
        }
}
We report on the first long-term application of squeezed vacuum states of light to improve the shot-noise-limited sensitivity of a gravitational-wave observatory. In particular, squeezed vacuum was applied to the German-British detector GEO 600 during a period of three months from June to August 2011, when GEO 600 was performing an observational run together with the French-Italian Virgo detector. In a second period, the squeezing application continued for about 11 months from November 2011 to… 

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