@article{8319,
  abstract     = {We demonstrate that releasing atoms into free space from an optical lattice does not deteriorate cavity-generated spin squeezing for metrological purposes. In this work, an ensemble of 500000 spin-squeezed atoms in a high-finesse optical cavity with near-uniform atom-cavity coupling is prepared, released into free space, recaptured in the cavity, and probed. Up to ∼10 dB of metrologically relevant squeezing is retrieved for 700μs free-fall times, and decaying levels of squeezing are realized for up to 3 ms free-fall times. The degradation of squeezing results from loss of atom-cavity coupling homogeneity between the initial squeezed state generation and final collective state readout. A theoretical model is developed to quantify this degradation and this model is experimentally validated.},
  author       = {Wu, Yunfan and Krishnakumar, Rajiv and Martínez-Rincón, Julián and Malia, Benjamin K. and Hosten, Onur and Kasevich, Mark A.},
  issn         = {2469-9934},
  journal      = {Physical Review A},
  number       = {1},
  publisher    = {American Physical Society},
  title        = {{Retrieval of cavity-generated atomic spin squeezing after free-space release}},
  doi          = {10.1103/PhysRevA.102.012224},
  volume       = {102},
  year         = {2020},
}