Optimizing a dynamical decoupling protocol for solid-state electronic spin ensembles in diamond

D. Farfurnik,1,2 A. Jarmola,3 L. M. Pham,4 Z. H. Wang,5 V. V. Dobrovitski,6 R. L. Walsworth,4,7 D. Budker,3,8 and N. Bar-Gill1,2,9 1Racah Institute of Physics, Hebrew University, Jerusalem 9190401, Israel 2The Center for Nanoscience and Nanotechnology, Hebrew University, Jerusalem 9190401, Israel 3Department of Physics, University of California, Berkeley, California 94720-7300, USA 4Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA 5Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA 6Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA 7Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA 8Helmholtz Institute, Johannes Gutenberg-University, 55099 Mainz, Germany 9Department of Applied Physics, Rachel and Selim School of Engineering, Hebrew University, Jerusalem 9190401, Israel (Received 5 May 2015; revised manuscript received 3 August 2015; published 24 August 2015)