1. Centre for Quantum Computation and Communication Technology School of Physics University of Melbourne Parkville VIC 3010 Australia
2. Melbourne Centre for Nanofabrication Clayton VIC 3168 Australia
3. School of Physics University of Melbourne Parkville VIC 3010 Australia
4. Institute for Solid State Physics and Optics Wigner Research Centre for Physics Hungarian Academy of Sciences POB49 Budapest H‐1525 Hungary
5. Department of Chemistry and Physics La Trobe University Bundoora Victoria 3086 Australia
6. Schulich Faculty of Chemistry Israel Institute of Technology Technion Haifa 32000 Israel
7. Australian Synchrotron Clayton VIC 3168 Australia
8. Department of Electrical Engineering Princeton University Princeton NJ 08544 USA
9. Department of Atomic Physics Budapest University of Technology and Economics Budafoki út 8 Budapest H‐1111 Hungary