https://doi.org/10.1140/epjb/s10051-022-00317-w
Regular Article - Mesoscopic and Nanoscale Systems
Quantum coherence of a single NV center in a spin-cavity hybrid system
1
Key Laboratory of Strongly-Coupled Matter Physics, Chinese Academy of Sciences, Hefei National Laboratory for Physical Science at Microscale, 230026, Hefei, Anhui, People’s Republic of China
2
Department of Physics, University of Science and Technology of China, 230026, Hefei, Anhui, People’s Republic of China
3
College of Physics, Sichuan University, No.24 South Section 1, Yihuan Road, 610065, Chengdu, Sichuan, People’s Republic of China
Received:
6
December
2021
Accepted:
9
March
2022
Published online:
29
March
2022
Hybrid interfaces between photonic cavities and quantum emitters are promising physical platforms in the fields of quantum sensing, quantum metrology and quantum information processing. Light-matter interaction in these systems can be engineered into the regime of strong coupling and ultrastrong coupling. In this work we experimentally explore the coherent properties of a single solid spin in a hybrid system consisting of a nitrogen-vacancy center in nanodiamond and a metal-dielectric cavity. We statistically characterize the cavity enhancement factor of fluorescence intensity for a group of single nitrogen-vacancy centers. The fluorescence intensity of a single nitrogen-vacancy center can be enhanced in a metal-dielectric cavity with a factor about 3. We measure the relaxation time 
and decoherence time 
of nitrogen-vacancy centers and show the robustness of spin coherent properties in a cavity. This work shows the possibility of selectively controlling on the optical and spin coherence of a single nitrogen-vacancy center in a nanocavity. The spin-cavity hybrid system can be further used in applications such as quantum sensing and quantum engineering with nitrogen-vacancy centers.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022
