1. Institute for Quantum Computing, University of Waterloo, Waterloo, ON N2L3G1, Canada.
2. Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L3G1, Canada.
3. Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, College Park, MD 20742, USA.
4. Department of Chemistry, University of Waterloo, Waterloo, ON N2L3G1, Canada.
5. Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
6. National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.