1. School of Mathematical and Physical Sciences, Macquarie University, NSW 2109, Australia
2. Centre for Quantum Software and Information, Faculty of Engineering and IT, University of Technology Sydney, NSW 2007, Australia
3. Centre for Quantum Computation and Communication Technology, School of Science, RMIT University, Melbourne, VIC 3000, Australia
4. School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14850, USA