Dressed spin states, a spin coupling to continuous radiation fields, can fundamentally change how a spin responds to magnetic fluctuations. Using dressed spin states, we were able to protect an electron spin in diamond from decoherence. Dressing a spin with resonant microwaves at a coupling rate near 1 MHz leads to a 50 times reduction in the linewidth of the spin transition, limited by transit-time broadening. The spin decoherence and the energy level structure of the dressed states were probed with optical coherent-population-trapping processes. Compared with dynamical decoupling, where effects of the bath are averaged out at specific times, the dressed state provides a continuous protection from decoherence.
@article{arxiv.1409.3786,
title = {Protecting a solid-state spin from decoherence using dressed spin states},
author = {D. Andrew Golter and Thomas K. Baldwin and Hailin Wang},
journal= {arXiv preprint arXiv:1409.3786},
year = {2015}
}