1. Chemical Physics Theory Group, Department of Chemistry, University of Toronto, 80 Saint George St., Toronto, Ontario M5S 3H6, Canada
2. Department of Physics, Indian Institute of Science Education and Research, Dr. Homi Bhaba Road, Pune, India
3. Centre for Quantum Information and Quantum Control, University of Toronto, 80 Saint George St., Toronto, Ontario M5S 3H6, Canada