1. School of Physics, University of Melbourne, Melbourne, VIC 3010, Australia
2. Centre for Quantum Computation and Communication Technology, School of Physics, University of Melbourne, Melbourne, VIC 3010, Australia
3. School of Engineering, College of Engineering and Computer Science, Australian National University, Canberra, ACT 2601, Australia
4. School of Science, RMIT University, Melbourne, VIC 3001, Australia
5. Centre for Quantum Computation and Communication Technology, School of Engineering, The Australian National University, Canberra, ACT 2601, Australia