@ARTICLE{Beloy2021564, title = {{F}requency ratio measurements at 18-digit accuracy using an optical clock network}, status = {}, author = {Beloy, K. and Bodine, M.I. and Bothwell, T. and Brewer, S.M. and Bromley, S.L. and Chen, J.-S. and Deschênes, J.-D. and Diddams, S.A. and Fasano, R.J. and Fortier, T.M. and Hassan, Y.S. and Hume, D.B. and Kedar, D. and Kennedy, C.J. and Khader, I. and Koepke, A. and Leibrandt, D.R. and Leopardi, H. and Ludlow, A.D. and McGrew, W.F. and Milner, W.R. and Newbury, N.R. and Nicolodi, D. and Oelker, E. and Parker, T.E. and Robinson, J.M. and Romisch, S. and Schäffer, S.A. and Sherman, J.A. and Sinclair, L.C. and Sonderhouse, L. and Swann, W.C. and Yao, J. and Ye, J. and Zhang, X. and Boulder Atomic Clock Optical Network (BACON) Collaboration*}, journal = {Nature}, volume = {591}, pages = {564-569}, year = {2021}, }