We realize an elementary quantum network node consisting of a silicon-vacancy (SiV) color center inside a diamond nanocavity coupled to a nearby nuclear spin with 100 ms long coherence times. Specifically, we describe experimental techniques and discuss effects of strain, magnetic field, microwave driving, and spin bath on the properties of this 2-qubit register. We then employ these techniques to generate Bell-states between the SiV spin and an incident photon as well as between the SiV spin and a nearby nuclear spin. We also discuss control techniques and parameter regimes for utilizing the SiV-nanocavity system as an integrated quantum network node.
@article{arxiv.1907.13200,
title = {An integrated nanophotonic quantum register based on silicon-vacancy spins in diamond},
author = {C. T. Nguyen and D. D. Sukachev and M. K. Bhaskar and B. Machielse and D. S. Levonian and E. N. Knall and P. Stroganov and C. Chia and M. J. Burek and R. Riedinger and H. Park and M. Lončar and M. D. Lukin},
journal= {arXiv preprint arXiv:1907.13200},
year = {2019}
}