Quantum Control Direction In The Migration Birds

The effect of the quantum mechanics within the biological molecules has become one of the basic problems of biology in the 20th century. With the development of experimental technology, the compound within biological molecules of the quantum mechanical effects can be directly observed by experiment. Recent experiments proved that dynamic process of organisms are still presenting a quantum effects in a complex noise environment. These discoveries have brought a unified and more general view to the study of quantum effects in biology, as there are other systems and functions where quantum coherence could again play a significant role. One such system is the avian magnetic compass.Migratory birds have the surprising capacity to be sensitive to the Earth's magnetic field, both to its direction and to its very low intensity (below 100?T). Although the origin of the avian magnetic compass sensor remains an open problem, the hypothesis with strongest support from evidences is that this mechanism derives from the quantum spin dynamics of transient photo-induced radical pairs. If so, this motivates us to reproduce this behaviour in an artificial system, and control it to achieve ultra-fine magnetic sensing.Using the theory of quantum mechanics, we abstract this chemical reaction to quantum models. We mainly focus on two different theoretical models of bird migration. They are single nucleus and double nuclei model of the radical pair respectively. In terms of quantum master equation, we calculate numerically of the ratio of singlet and triplet production closely related to the magnetic field orientation, and analyse the relationship between the bird migration and angle dependence of magnetic field. We found that, the ratio of singlet and triplet production is reduced with the magnetic field angle varying from 0° to 90°. This will correspondingly produce different signal to birds, by which the birds can navigate in flight. If the local magnetic field intensity decreases by 30%, we can see the numerical decrease and change trend decreases of yield ratio from the double nuclei model calculated data, then the birds lost their way; A very weak radio-frequency field is applied to estimate the reaction rates of the radical pair and we obtain the birds orientation time in flight, that is between 4 and 40 microseconds; The external environment can reduce yield ratio and the change trend, affecting the migration of birds, even destroying the orientation function. We will expatiate how the change of magnetic field angle effect on the migration of birds in theory.Finally, we will show the conclusions and discussion.