“…[10] and references therein for an updated review on the subject). Although there are some analytical techniques based on third quantization [11,12], resummation of perturbative series [13,14], weak symmetries [15], or flow equations [16], open quantum systems are generally characterized numerically, e.g., via exact diagonalization or time Density-Matrix-Renormalization-Group methods [17][18][19][20][21][22][23][24][25], which prevent in many cases a simple understanding of the phenomena.…”