1. Centre for Emerging Device Technologies, Department of Engineering Physics, McMaster University, Hamilton, Ontario L8S 4L7, Canada, Department of Physics and Astronomy and Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario L8S 4M1, Canada, and Institute for Quantum Computing, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada