All-optical formation of coherent dark states of silicon-vacancy spins in diamond

We gratefully acknowledge financial support by the University of Cambridge, the European Research Council (FP7/2007-2013)/ERC Grant Agreement No. 209636, and FP7 Marie Curie Initial Training Network SNANO3. This research has been partially funded by the European Community’s Seventh Framework Programme (FP7/2007-2013) under Grant Agreement No. 611143 (DIADEMS). A. I. T. and T. G. thank EPSRC Programme Grant No. EP/J007544/1 for support. Ion implantation was performed at and supported by RUBION, the central unit of the Ruhr-Universitat Bochum. We thank D. Rogalla for the implantation, C. Pauly for SIL fabrication, the Sheffield group for their hospitality during the vector magnet measurements, and A. Lenhard for the Monte Carlo simulation of the intensity autocorrelation, as well as J. Barnes, J. Hansom, H. S. Knowles, J. M. Taylor, J. Eschner, and G. Morigi for helpful discussions.