Author Affiliations

Huijie Zheng,^1,* Jingyan Xu,² Geoffrey Z. Iwata,¹ Till Lenz,¹ Julia Michl,³ Boris Yavkin,³ Kazuo Nakamura,⁴ Hitoshi Sumiya,⁵ Takeshi Ohshima,⁶ Junichi Isoya,⁷ Jörg Wrachtrup,³ Arne Wickenbrock,¹ and Dmitry Budker^1,8,9,10

¹Johannes Gutenberg-Universit ̈at Mainz, 55128 Mainz, Germany

²Chinese Academy of Sciences, Key Lab of Quantum Information, University of Science and Technology of China, Hefei 230026, People’s Republic of China

³Institute of Physics, University of Stuttgart and Institute for Quantum Science and Technology IQST, 70174 Stuttgart, Germany

⁴Application Technology Research Institute, Tokyo Gas Company, Ltd., Yokohama, 230-0045 Japan

⁵Advanced Materials Laboratory, Sumitomo Electric Industries, Ltd., Itami, 664-0016 Japan

⁶Takasaki Advanced Radiation Research Institute, National Institutes for Quantum and Radiological Science and Technology, Takasaki, 370-1292, Japan

⁷Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, 305-8573 Japan

⁸Helmholtz Institut Mainz, 55099 Mainz, Germany

⁹Department of Physics, University of California, Berkeley, CA 94720-7300, USA

¹⁰Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

^*Corresponding author: zheng@uni-mainz.de