1. Department
of Physics, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
2. Department
of Physics, Aberystwyth University, SY23 3BZ Aberystwyth, United Kingdom
3. School
of Physics and Astronomy (SUPA), University of St. Andrews, St. Andrews, Fife KY16 9SS, United Kingdom
4. Fritz-Harber-Insitute Max-Planck Society, Faradayweg 4-6 14195 Berlin, Germany
5. MAX
IV Laboratory, Lund University, 221 00 Lund, Sweden
6. Centre
of Excellence for Quantum Computation and Communication Technology,
School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia
7. Department
of Physics and Astronomy, Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, 8000 Aarhus C, Denmark