1 Department of Electrical and Computer Engineering, University of Washington, Seattle, Washington 98195, USA
2 Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario ON N2L 3G1, Canada
3 Institute of Quantum Computing, University of Waterloo, Waterloo, Ontario ON N2L 3G1, Canada
4 Google, Mountain View, California 94043, USA
5 Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario ON N2L 3G1, Canada
6 Department of Physics, University of Washington, Seattle, Washington 98195, USA