@article{3281,
  author = {M. Martin and M. Bishof and M. Swallows and X. Zhang and Craig Benko and J. von Stecher and Alexey Gorshkov and Ana Maria Rey and Jun Ye},
  title = {A Quantum Many-Body Spin System in an Optical Lattice Clock},
  abstract = {Strongly interacting quantum many-body systems arise in many areas of physics, but their complexity generally precludes exact solutions to their dynamics. We explored a strongly interacting two-level system formed by the clock states in 87Sr as a laboratory for the study of quantum many-body effects. Our collective spin measurements reveal signatures of the development of many-body correlations during the dynamical evolution. We derived a many-body Hamiltonian that describes the experimental observation of atomic spin coherence decay, density-dependent frequency shifts, severely distorted lineshapes, and correlated spin noise. These investigations open the door to further explorations of quantum many-body effects and entanglement through use of highly coherent and precisely controlled optical lattice clocks.},
  year = {2013},
  journal = {Science},
  volume = {341},
  pages = {632-636},
  month = {2013-08},
  issn = {0036-8075},
  url = {http://www.sciencemag.org/cgi/doi/10.1126/science.1236929},
  doi = {10.1126/science.1236929},
}