Derek F. Jackson Kimball⁵, Matthew Lawson⁶, Declan W. Smith⁷, Alexander O. Sushkov^7,8,9,10, Dmitry Budker^1,2,3,11, Hendrik Bekker^1,2,3,†, and Arne Wickenbrock^1,2,3

• ¹Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
• ²Helmholtz Institute Mainz, 55099 Mainz, Germany
• ³GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
• ⁴Quantum Technology Center, University of Maryland, College Park, Maryland 20742, USA
• ⁵Department of Physics, California State University–East Bay, Hayward, California 94542-3084, USA
• ⁶Physics Department, Stockholm University, Albanova University Centre, SE-10691 Stockholm, Sweden
• ⁷Department of Physics, Boston University, Boston, Massachusetts 02215, USA
• ⁸Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215, USA
• ⁹Photonics Center, Boston University, Boston, Massachusetts 02215, USA
• ¹⁰Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA
• ¹¹Department of Physics, University of California, Berkeley, California 94720-7300, USA

• ^*These authors contributed equally to this work.
• ^†Contact author: hbekker@uni-mainz.de