1. Department of Electrical Engineering and Information Technology (DIETI), University of Naples Federico II, Naples, Italy
2. Department of Mathematics and Statistics, University of Ottawa, Ottawa, ON, Canada
3. CNRS, LIP6, Sorbonne Université, Paris, France
4. School of Mathematics and Physics, The University of Queensland, St Lucia, QLD, Australia
5. Electrical Engineering, Mathematics and Computer Science-Quantum Computer Science Faculty, Delft University of Technology, Delft, CJ, The Netherlands