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arXiv:1804.07004 · Physical Review X

Ab Initio Magneto-Optical Spectrum of Group-IV Vacancy Color Centers in Diamond

Gergő Thiering, Adam Gali

Published Jun 11, 2018• 209 citations
arXivHTMLPDF

Abstract

Lead- and tin-vacancy centers in diamond could work as a solid-state source of single photons with addressable spins at more practical temperatures than other approaches, an essential step for practical quantum communication networks.
DOI
10.1103/physrevx.8.021063

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The development of reliable devices to generate single photons is crucial for applications in quantum cryptography, as well as for fundamental quantum optics experiments. Due to their extremely high photostability at room temperature, optically active defects in solids, the so called color centers, are among the most promising candidates. Single NV (nitrogen-vacancy) centers in diamond have been demonstrated to be able to generate single photons and have already shown advantages compared to attenuated laser pulses in a quantum cryptography experiment. The nitrogen-vacancy center (NV center) in diamond consists of a substitutional nitrogen atom and an adjacent vacancy. This complex exhibits an optical transition with a fluorescence lifetime of 11.6 ns. The room temperature spectrum of the NV center consists of the zero-phonon line at 637 nm and broad phononic sidebands with a FWHM of more than 100 nm. Due to the existence of a shelving level the efficiency of the NV center as a single photon source is limited. Additionally, the high diffraction index of bulk diamond restricts the efficiency to collect the fluorescence light.