“…In a similar experiment a single NV center was used to create this topological structure of a tensor monopole [24]. Another prominent approach to topology in synthetic dimensions are multiterminal Josephson junctions [25,26,27,28,29,30,31,32,33,34] or topological superconducting circuits [35,36,37], where the topology is defined in the space of superconducting phases. Due to the scalability, superconducting Josephson circuits are the most promising candidate for realistic implementations of quantum technologies, see for example the reviews [38,39].…”