B. P. Lanyon, C. Hempel, D. Nigg, M. Müller, R. Gerritsma, F. Zähringer, P. Schindler, J. T. Barreiro, M. Rambach, G. Kirkmair, M. Hennrich, P. Zoller, R. Blatt, C. F. Roos, Universal Digital Quantum Simulation with Trapped Ions, Science DOI. 10.1126/science. 1208001
Published Online September 1, 2011
Press release at the link: http://physicsworld.com/cws/article/news/47101