1. Department of Computer Science, Sapienza University of Rome, Rome, Italy
2. EURECOM, Sophia Antipolis, Biot, France
3. Centre for Quantum Technologies, National University of Singapore, Queenstown, Singapore
4. Department of Computing, Imperial College London, London, U.K.
5. Computer Science Department, Aarhus University, Aarhus, Denmark
6. Faculty of Science, Technology and Communication, University of Luxembourg, Esch-sur-Alzette, Luxembourg