J.
Haah
Beverland, M. E., Haah, J. ., Alagic, G. ., Campbell, G. K., Rey, A. M., & Gorshkov, A. V. (2018). Spectrum estimation of density operators with alkaline-earth atoms. Physical Review Letters, 120. http://doi.org/10.1103/PhysRevLett.120.025301