1. School of Aerospace, Mechanical and Manufacturing Engineering, RMIT University, Melbourne, Victoria 3000, Australia
2. Centre for Quantum Computation and Communication Technology, School of Physics, University of Melbourne, Melbourne, Victoria 3010, Australia
3. School of Physics and Advanced Materials, University of Technology Sydney, Ultimo, New South Wales 2007, Australia
4. Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
5. SemiConductor Analysis and Radiation Effects Group, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292, Japan
6. Department of Atomic Physics, Budapest, University of Technology and Economics, Budafoki út 8, H-1111, Budapest, Hungary