Coherence of Nitrogen-Vacancy Electronic Spin Ensembles in Diamond

eld relative to the NV electronic spin axis, consistent with theoretical modeling of NV coupling to a 13 C nuclear spin bath. The long coherence times and increased signal-to-noise provided by NV ensembles will aid many applications of NV centers in precision magnetometry and quantum information. The Nitrogen-Vacancy (NV) color center in diamond is a promising solid state platform for studying the quantum dynamics of spin systems. Experiments demonstrating spin-state control and manipulation using single NV centers and their nuclear environment [1{5] have inspired recent work towards quantum information applications of NV diamond, as well as applications to precision magnetic