Scalable spin squeezing for quantum-enhanced magnetometry with Bose-Einstein condensates.

@article{Muessel2014ScalableSS,
  title={Scalable spin squeezing for quantum-enhanced magnetometry with Bose-Einstein condensates.},
  author={Wolfgang Muessel and Helmut Strobel and Daniel Linnemann and David B. Hume and M. K. Oberthaler},
  journal={Physical review letters},
  year={2014},
  volume={113 10},
  pages={103004}
}
A major challenge in quantum metrology is the generation of entangled states with a macroscopic atom number. Here, we demonstrate experimentally that atomic squeezing generated via nonlinear dynamics in Bose-Einstein condensates, combined with suitable trap geometries, allows scaling to large ensemble sizes. We achieve a suppression of fluctuations by 5.3(5) dB for 12,300 particles, from which we infer that similar squeezing can be obtained for more than 10(7)  atoms. With this resource, we… CONTINUE READING