“…The study of quantum systems confined in a bounded domain requires a careful description of the physical properties of its boundary, and thus of the interaction between the system and the boundary, effectively encoded via a proper choice of boundary conditions. In recent years, quantum boundary conditions have increasingly attracted interest in different branches of quantum physics [1,2], some examples being the analysis of quantum Hall systems [3,4], the study of geometric phases [5], quantum control theory, topological insulators and QCD [6], quantum gravity and topology change [7,8], as well as the Casimir effect in quantum field theory [9,10,11], to name a few.…”