1. Quantum Simulations Group, Lawrence Livermore National Laboratory, Livermore, California 94551, USA
2. Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
3. HEDP Theory Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
4. Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA