1. Department of Physics, University of Waterloo, Waterloo, ON N2L3G1, Canada
2. Institute for Quantum Computing, University of Waterloo, Waterloo, ON N2L3G1, Canada
3. Department of Physics, University of Illinois at Urbana—Champaign, Urbana, Illinois 61801, United States
4. Canadian Institute for Advanced Research, Toronto, ON M5G1Z8, Canada