Here are the references related to the discussion we had on July 6th:
  • L. Levitin and T. Toffoli, arXiv:0905.3417
  • E.H. Lieb and D.W. Robinson, Commun. Math. Phys. 28, 251 (1972)
  • S. Bravyi, M.B. Hastings, and F. Verstraete, PRL 97, 050401 (2006)
  • J. Eisert, D. Gross, PRL 102, 240501 (2009)
  • N. Khaneja, F. Kramer, S.J. Glaser, Journal of Magnetic Resonance 173, 116 (2005)
  • T.O. Reiss, N. Khaneja, and S.J. Glaser, Journal of Magnetic Resonance 154, 192 (2002)
  • N. Khaneja, R. Brockett, and S.J. Glaser, PRA 63, 032308 (2001)
  • H. Yuan, S.J. Glaser, and N. Khaneja, PRA 76, 012316 (2007)
  • H. Yuan, R. Zeier, and N. Khaneja, PRA 77, 032340 (2008)
  • H. Yuan and N. Khaneja, PRA 72, 040301 (2005)
  • R. Zeier, H. Yuan, and N. Khaneja, PRA 77, 032332 (2008)
  • T. Caneva, M. Murphy, T. Calarco, R. Fazio, S. Montangero, V. Giovannetti, G.E. Santoro, arXiv:0902.4193