= Yikang Zhang
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<Yikang Zhang>, with <Thomas Barthel>, characterized <Davies irreducibility> in <quantum dynamical semigroups>. In their finite-dimensional criterion, the multiplicative algebra generated by the <Lindblad operators> and $K=iH+\tfrac12\sum_aL_a^\dagger L_a$ must be the full operator algebra, with $\hbar=1$.<Criteria for Davies Irreducibility of Markovian Quantum Dynamics by Yikang Zhang and Thomas Barthel>[Main criterion; corrected drift-operator normalization in the current version]{ref}
This makes dynamical accessibility an algebraic question. Changing a Hamiltonian term or a dissipator can change irreducibility even when much of the model is left in place.
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