Protecting a solid-state spin from decoherence using dressed spin states

TL;DR

This paper demonstrates that using resonant microwave dressing fields can significantly reduce decoherence in solid-state electron spins, providing continuous protection compared to traditional dynamical decoupling methods.

Contribution

The study introduces a method of protecting solid-state spins from decoherence through microwave-induced dressed states, achieving a 50-fold linewidth reduction.

Findings

50 times reduction in spin transition linewidth

Protection limited by transit-time broadening

Dressed states offer continuous decoherence protection

Abstract

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.