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Ya. S. Greenberg, A. A. Shtygashev, and A. G. Moiseev, Spontaneous decay of artificial atoms in a multi-qubit system, Low Temp. Phys. 47, (2021) [Fiz. Nizk. Temp. 47, 907-916, (2021)] DOI: https://doi.org/10.1063/10.0006063.