  A model of charge separation in quantum photosynthesis as a model of quantum
feedback control in a system of interacting excitons and vibrons is introduced.
Quantum feedback in this approach describes the Landau--Zener transition with
decoherence. The model explains irreversibility in the process of charge
separation for quantum photosynthesis -- direct transitions for this quantum
control model will have probabilities close to one and reverse transitions will
have probabilities close to zero. This can be considered as a model of quantum
ratchet. Also this model explains coincidence of energy of the vibron paired to
the transition and Bohr frequency of the transition.
