1. CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China 1 , Hefei 230026, China
2. CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China 2 , Hefei 230026, China
3. Institute for Physics, Quantum Technology, University of Rostock 3 , Rostock, Germany
4. Department of Life, Light and Matter, Quantum Technology, University of Rostock 5 , Rostock, Germany
5. Physics Department, Technical University of Munich 4 , München, Germany
6. Munich Center for Quantum Science and Technology (MCQST) 6 , München, Germany