Bound on the relaxation rates of solutions a quantum master equation

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Which conditions does the Universal quantum relaxation rate require? (Courtesy: Gen Kimura)
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Rates versus positivity class
In a series of papers, culminating with a publication in the prestigious Reports on Progress on Physics together with Dariusz Chruściński, Frederik vom Ende and Gen Kimura we proved that the relaxation rates of a map solution of a quantum master equation obeys a non-trivial upper bound. The bound relates measurable quantities and only depends on the positivity class of the semi-group whereof the map is an element. This paper was selected as an IOP Publishing Research Highlight
One reason that makes the bound particularly interesting because has no classical counterpart. as such it is a distinctive trait of open quantum system dynamics. The bound was conjectured by Kimura in the early 00's of this century and remained unproven for about two decades.