Frequency ratio measurements at 18-digit accuracy using an optical clock network

K. Beloy, Martha I. Bodine, Tobias Bothwell, Samuel M. Brewer, Sarah Bromley, Jwo-Sy Chen, Jean-Daniel Deschênes, Scott A. Diddams, Robert Fasano, Tara M. Fortier, Youssef S. Hassan, David Hume, Dhruv Kedar, Colin J. Kennedy, Isaac Khader, A. Sophia Koepke, David R. Leibrandt, Holly Leopardi, Andrew D. Ludlow, William F. McGrew, William R. Milner, Nathan R. Newbury, Daniele Nicolodi, E. Oelker, T.E. Parker, John Robinson, Stefania Romisch, Stefan Alaric Schäffer, Jeffrey A. Sherman, Laura C. Sinclair, Lindsay Sonderhouse, William C. Swann, Jian Yao, Jun Ye, X. Zhang