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In a recent Letter, Guarnieri et al. [1] reported on the possibility ofgenerating steady-state coherence (SSC) in the energy basis of a two-levelsystem by the sole action of a single thermal bath also for weak system-bathcoupling and due to a composite form of this interaction. The results are basedon a time-local Bloch-Redfield master equation without secular approximationand the associated set of Bloch equations, all derived in the SupplementalMaterial (SM) of Ref. [1]. We comment that the results reported by the authorspresent both technical flaws and conceptual limitations that substantiallyimpact some of their main conclusions. Our objections mainly concern (a)technical errors in the calculation of SSC (Eqs.(2)-(4) in [1]) and (b)negativity issues associated with the weak-coupling master equation employed bythe authors.

Comment on "Steady-State Coherences by Composite System-Bath Interactions"