Authors: R. Barends, Alireza Shabani, Lucas Lamata, J. Kelly, Antonio Mezzacapo, U. Las Heras, Ryan Babbush, Austin G. Fowler, B. Campbell, Yu Chen, Z. Chen, B. Chiaro, A. Dunsworth, E. Jeffrey, Erik Lucero, A. Megrant, J. Mutus, M. Neeley, C. Neill, P. O’Malley, Chris Quintana, P. Roushan, D. Sank, A. Vainsencher, J. Wenner, T. White, E. Solano, Hartmut Neven, John M. Martinis - Nature 2016 cited by 477