Characterizing the Temperature Dependence of NV and P1 Center Coherence Times

The NV center in diamond is an attractive platform for quantum sensing and simulation, due to its optical addressability and long coherence time. Operation at lower temperatures increases coherence times further, which could also enable access to correlated many-body states. We use pulsed electron paramagnetic resonance to characterize the coherence properties of both NV and P1 centers in the same samples using Hahn echo and CPMG experiments from room temperature down to liquid helium temperatures. Since the dynamics of nitrogen-based spin ensembles in diamond are made more complex by the heterogeneity present in most synthetic diamond samples, we compare the results obtained from both an HPHT sample and a DNVB14 sample from Element 6. In combination with numerical simulations, we attempt to identify the temperature dependence of various decoherence mechanisms for these defects. These studies provide insight into the optimal operating conditions for different types of diamond samples