  Transport in nonequilibrium degenerate quantum systems is investigated.
Transfer rate depends on parameters of the system. In this paper we investigate
dependence of the flow (transfer rate) on the angle between "bright" vectors
(which define interaction of the system with the environment). We show that in
some approximation for the system under investigation the flow is proportional
to cosine squared of the angle between "bright" vectors. Earlier in
arXiv:1603.07182 it was shown that in this degenerate quantum system excitation
of non-decaying quantum "dark" states is possible, moreover the effectiveness
of this process is proportional to sine squared of the angle between "bright"
vectors (this phenomenon was discussed as a possible model of excitation of
quantum coherences in quantum photosynthesis). Thus quantum transport and
excitation of dark states are competing processes, dark states can be
considered as a result of leakage of quantum states in quantum thermodynamic
machine which performs the quantum transport.
