1. Quantum Research Group, School of Chemistry and Physics, University of KwaZulu-Natal, Durban 4001, South Africa
2. Institute for Lasers, Life and Biophotonics, Faculty of Sciences, VU University Amsterdam, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands
3. ARC Centre of Excellence for Engineered Quantum Systems, The University of Queensland, St Lucia 4072, Australia
4. Cavendish Laboratory, University of Cambridge, Cambridge, UK
5. National Institute for Theoretical Physics, KwaZulu-Natal, South Africa
6. Department of Physics, Faculty of Natural and Agricultural Sciences, University of Pretoria, Hatfield, South Africa