1. Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, United States
2. Department
of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
3. Quantum
Theory Group, Security and Disruptive Technologies, Emerging Technologies
Division, National Research Council of Canada, Ottawa, Ontario, K1A OR6 Canada
4. Department
of Chemistry, Indiana University, Bloomington, Indiana 47405, United States