Quantum coherence of a single NV center in a spin-cavity hybrid system Jian Zhang, Shengran Lin, Junfeng Wang, Liren Lou, Wei Zhu and Guanzhong Wang Eur. Phys. J. B, 95 3 (2022) 61 Published online: 29 March 2022 DOI: 10.1140/epjb/s10051-022-00317-w