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

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

2009-02-13

arxiv.org/abs/0902.2387v1

Physics

Condensed Matter

Materials Science

4 pages, 1 figure

Scientific paper

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

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