@article{3404,
  author = {E. Kessler and P Kómár and M. Bishof and L. Jiang and A. Sørensen and Jun Ye and M. Lukin},
  title = {Heisenberg-Limited Atom Clocks Based on Entangled Qubits},
  year = {2014},
  journal = {Physical Review Letters},
  volume = {112},
  pages = {190403},
  month = {2015-04},
  issn = {0031-9007},
  url = {http://link.aps.org/doi/10.1103/PhysRevLett.112.190403},
  doi = {10.1103/PhysRevLett.112.190403},
}