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The negatively charged nitrogen-vacancy defect (NV)$^-$ in diamond hasattracted much attention in recent years in qubit and biological applications.The negative charge is donated from nearby nitrogen donors that could limit orstem the successful application of (NV)$^-$. In this Letter, we unambiguouslyidentify the \emph{neutral} nitrogen-vacancy defect (NV$^0$) by \emph{abinitio} supercell calculations. Our analysis shows that i) the spin state canbe \emph{selectively} occupied optically, ii) the electron spin state can bemanipulated by time-varying magnetic field, and iii) the spin state may be readout optically. Based on this NV$^0$ is a new hope for realizing qubit indiamond \emph{without} the need of nitrogen donors.

Theory of neutral nitrogen-vacancy center in diamond and its qubit application