Park, Huijin Lee, Junghyun Han, Sangwook Oh, Sangwon Seo, Hosung 2024-01-19T11:31:48Z 2024-01-19T11:31:48Z 2022-08-25 2022-08 2056-6387 https://pubs.kist.re.kr/handle/201004/114807 Nitrogen-vacancy (NV) centers in diamond have been developed into essential hardware units for a wide range of solid-state-based quantum technology applications. While such applications require the long spin lifetimes of the NV centers, they are often limited due to decoherence. In this study, we theoretically investigate the decoherence of NV-spin ensembles induced by nitrogen impurities (P1 centers), which are one of the most dominant and inevitable magnetic field noise sources in diamond. We combined cluster correlation expansion and density functional theory to compute the Hahn-echo spin-coherence time of the NV centers for a broad range of P1 concentrations. Results indicate a clear linear dependence of T-2 on P1 concentrations on a log scale with a slope of -1.06, which is in excellent agreement with previous experimental results. The interplay between the Jahn-Teller effect and the hyperfine interaction in the P1 center plays a critical role in determining the bath dynamics and the resulting NV decoherence. Our results provide a theoretical upper bound for the NV-spin T-2 over a wide range of P1 densities, serving as a key reference for materials optimization and spin bath characterization to develop highly coherent NV-based devices for quantum information technology. English The University of New South Wales (UNSW Australia) | Nature Publishing Group Decoherence of nitrogen-vacancy spin ensembles in a nitrogen electron-nuclear spin bath in diamond Article 10.1038/s41534-022-00605-4 1 npj Quantum Information, v.8, no.1 npj Quantum Information 8 1 Y scie scopus 000840079300001 Quantum Science & Technology Physics, Applied Physics, Atomic, Molecular & Chemical Physics, Condensed Matter Physics Article SOLID-STATE SPIN RESONANCE CENTERS