1Department of Physics, Arnold Sommerfeld Center for Theoretical Physics (ASC), Munich Center for Quantum Science and Technology (MCQST), Ludwig-Maximilians-Universität München, 80333 München, Germany
2Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
3SUPA, Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
4Institute for Theoretical Physics, Georg-August-University Göttingen, 37077 Göttingen, Germany