Color centers in diamond provide a promising platform for quantum optics in the solid state, with coherent optical transitions and long-lived electron and nuclear spins. Building upon recent demonstrations of nanophotonic waveguides and optical cavities in single-crystal diamond, we now demonstrate on-chip diamond nanophotonics with a high efficiency fiber-optical interface, achieving > 90% power coupling at visible wavelengths. We use this approach to demonstrate a bright source of narrowband single photons, based on a silicon-vacancy color center embedded within a waveguide-coupled diamond photonic crystal cavity. Our fiber-coupled diamond quantum nanophotonic interface results in a high flux of coherent single photons into a single mode fiber, enabling new possibilities for realizing quantum networks that interface multiple emitters, both on-chip and separated by long distances.
@article{arxiv.1612.05285,
title = {A fiber-coupled diamond quantum nanophotonic interface},
author = {Michael J. Burek and Charles Meuwly and Ruffin E. Evans and Mihir K. Bhaskar and Alp Sipahigil and Srujan Meesala and Denis D. Sukachev and Christian T. Nguyen and Jose L. Pacheco and Edward Bielejec and Mikhail D. Lukin and Marko Lončar},
journal= {arXiv preprint arXiv:1612.05285},
year = {2017}
}