1. Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
2. Center for Quantum Technology Research, School of Physics, Beijing Institute of Technology, Haidian, Beijing 100081, China
3. Brain Research Centre, University of British Columbia, Vancouver, British Columbia V6T 2B5, Canada
4. Department of Physics and Astronomy, and Genome Sciences and Technology Program, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada