Squeezing with cold atoms
  Cold atoms from a magneto-optic trap have been used as a nonlinear medium in a nearly resonant cavity. Squeezing in a probe beam passing through the cavity was demonstrated. The measured noise reduction is 40% for free atoms and 20% for weakly trapped atoms. 
A. Lambrecht, T. Coudreau, A.M. Steinberg and E. Giacobino