Author Affiliations

H. Leopardi,^1,2,* K. Beloy,¹ M. I. Bodine,¹ T. Bothwell,^2,3 S. Brewer,¹ S. Bromley,^2,3 J. Chen,¹ J. D. Deschenes,⁴ S. A. Diddams,^1,2 R. Fasano,^1,2 T. M. Fortier,^1,2 D. H. Hume,¹ D. Kedar,^2,3 C. J. Kennedy,² I. Khader,^1,2 D. R. Leibrandt,^1,2 A. Ludlow,¹ W. F. McGrew,^1,2 W. Milner,^2,3 N. Newbury,¹ D. Nicolodi,¹ E. Oelker,^2,3 J. M. Robinson,^2,3 S. A. Schafer,¹ J. A. Sherman,¹ L. C. Sinclair,¹ L. Sonderhouse,^2,3 W. C. Swann,¹ D. J. Wineland,¹ J. Yao,^1,2 J. Ye,^1,2,3 and X. Zhang¹

¹National Institute of Standards and Technology (NIST), Boulder, Co, U.S.A.

²University of Colorado Boulder, Boulder, Co, U.S.A.

³JILA, Boulder, Co, U.S.A.

⁴Octosig Consulting, Quebec City, Quebec, Canada

^*Corresponding author: holly.leopardi@nist.gov