Coupling diamond defect centers to Fabry-Perot microcavities

The long-lived, optically accessible spin states of defect centers in diamond provide a promising platform for quantum network applications, with entanglement distribution between distant nitrogen-vacancy defects already demonstrated. By integrating defect centers into optical resonators, more efficient or even deterministic protocols could be possible. While systems based on diamond nanophotonics have been pursued for more than a decade, Fabry-Perot microcavities present a complementary approach that may be better suited to nitrogen-vacancy centers. This talk will give an overview of the potential benefits and challenges to this approach, examine progress over the last few years, highlight recent results demonstrating coupling of germanium-vacancy defect centers in a diamond membrane to a high finesse microcavity at room temperature, and discuss development of an actively stabilized cryogenic system. \\ \\ In collaboration with: Erika Janitz, McGill University, Rasmus Jensen, Technical University of Denmark, Yannik Fontana, Technical University of Denmark , Yi He, Carnegie Mellon University, Olivier Gobron, Technical University of Denmark, Ilya Radko, Technical University of Denmark, Mihir Bhaskar, Harvard University, Ruffin Evans, Harvard University, Cesar Daniel Rodriguez Rosenblueth, McGill University, Rigel Zifkin, McGill University, Alexander Huck, Technical University of Denmark, Ulrik Andersen, Technical University of Denmark.