Spontaneous decay of artificial atoms in a three-qubit system Ya. S. Greenberg, A. A. Shtygashev and A. G. Moiseev Eur. Phys. J. B, 94 11 (2021) 221 Published online: 08 November 2021 DOI: 10.1140/epjb/s10051-021-00228-2