A
Rey
Martin, M. ., Bishof, M. ., Swallows, M. ., Zhang, X. ., Benko, C. ., von-Stecher, J. ., … Ye, J. . (2013). A quantum many-body spin system in an optical lattice clock. Science, 341, 632. Retrieved from http://www.sciencemag.org/content/341/6146/632.abstract