@misc{W1607705556,
  author = {C. A. Sackett and D. Kielpinski and B. E. King and C. Langer and V. Meyer and C. J. Myatt and M. Röwe and Q. A. Turchette and Wayne M. Itano and D. J. Wineland and C. Monroe},
  title = {Experimental entanglement of four particles},
  year = {2000},
  howpublished = {Nature},
  doi = {https://doi.org/10.1038/35005011}
}