We demonstrate the super-resolution localization of the nitrogen vacancy centers in diamond by a novel fluorescence photoswitching technique based on coherent quantum control. The photoswitching is realized by the quantum phase encoding based on pulsed magnetic field gradient. Then we perform super-resolution imaging and achieve a localizing accuracy better than 1.4 nm under a scanning confocal microscope. Finally, we show that the quantum phase encoding plays a dominant role on the resolution, and a resolution of 0.15 nm is achievable under our current experimental condition. This method can be applied in subnanometer scale addressing and control of qubits based on multiple coupled defect spins.
@article{arxiv.2008.01970,
title = {Super-resolution Localization of Nitrogen Vacancy Centers in Diamond with Quantum Controlled Photoswitching},
author = {Pengfei Wang and You Huang and Maosen Guo and Mengze Shen and Pei Yu and Mengqi Wang and Ya Wang and Chang-Kui Duan and Fazhan Shi and Jiangfeng Du},
journal= {arXiv preprint arXiv:2008.01970},
year = {2020}
}