title: Coherent optical transitions in implanted nitrogen vacancy centers.
abstract: We report the observation of stable optical transitions in nitrogen-vacancy (NV) centers created by ion implantation. Using a combination of high temperature annealing and subsequent surface treatment, we reproducibly create NV centers with zero-phonon lines (ZPL) exhibiting spectral diffusion that is close to the lifetime-limited optical line width. The residual spectral diffusion is further reduced by using resonant optical pumping to maintain the NV(-) charge state. This approach allows for placement of NV centers with excellent optical coherence in a well-defined device layer, which is a crucial step in the development of diamond-based devices for quantum optics, nanophotonics, and quantum information science.
authors.affiliation: Department of Physics, Harvard University , Cambridge, Massachusetts 02138, United States.
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authors.lastname: Chu
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authors.lastname: Loncar
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authors.lastname: Park
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authors.lastname: Maletinsky
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authors.lastname: Lukin