Author Affiliations

Lynden K. Shalm,¹ Evan Meyer-Scott,² Bradley G. Christensen,³ Peter Bierhorst,¹ Michael A. Wayne,^3,4 Martin J. Stevens,¹ Thomas Gerrits,¹ Scott Glancy,¹ Deny R. Hamel,⁵ Michael S. Allman,¹ Kevin J. Coakley,¹ Shellee D. Dyer,¹ Carson Hodge,¹ Adriana E. Lita,¹ Varun B. Verma,¹ Camilla Lambrocco,¹ Edward Tortorici,¹ Alan L. Migdall,^4,6 Yanbao Zhang,² Daniel R. Kumor,³ William H. Farr,⁷ Francesco Marsili,⁷ Matthew D. Shaw,⁷ Jeffrey A. Stern,⁷ Carlos Abellán,⁸ Waldimar Amaya,^8,9 Valerio Pruneri,^8,9 Thomas Jennewein,^2,10 Morgan W. Mitchell,^8,9 Paul G. Kwiat,³ Joshua C. Bienfang,^4,6 Richard P. Mirin,¹ Emanuel Knill,¹ and Sae Woo Nam¹

¹National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA

²Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, 200 University Ave West, Waterloo, Ontario, Canada, N2L 3G1

³Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA

⁴National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA

⁵Département de Physique et d’Astronomie, Université de Moncton, Moncton, New Brunswick E1A 3E9, Canada

⁶Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, 100 Bureau Drive, Gaithersburg, Maryland 20899, USA

⁷Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109

⁸ICFO –Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain

⁹ICREA –Institució Catalana de Recerca i Estudis Avançats, 08015 Barcelona, Spain

¹⁰Quantum Information Science Program, Canadian Institute for Advanced Research, Toronto, ON, Canada