| Quantum mechanics has experienced vigorous development nearly a century since it’s birth in 1920s,and now plays an irreplaceable role in human production and life.In recent decades,in addition to the more in-depth of the application to many branches of physics,quantum mechanics has also been widely used in chemistry,biology,materials science,information science and other fields which not only promoted the development of these disciplines greatly but also give rise to many emerging interdisciplinary,such as quantum biology,and quantum information science.Quantum biology is the application of quantum theory to the field of life sciences,and its contents include photosynthesis,enzymatic reactions,protein molecular folding and the mechanism of magnetic sensing in migratory birds.In this paper,the magnetic perception of migratory birds is studied.As we know,many animals have the ability to sense magnetic fields,but the biophysical mechanism by which this signal is accepted is still unclear.Although there have been many hypotheses including the radical pair model,there is still no unified and convincing model.Therefore,it is of great significance to study the navigation mechanism of migratory birds,which can deepen our understanding of life activities and stimulate the potential application of bionics.In this context,according to the MagR/Cry protein magnetic receptor previously discovered by Xie Can et al.,a novel mechanism for migratory birds to sense magnetic field and migrate based on resonance fluorescence spectrum was proposed in this paper.On the basis of the study of the magnetic sensing of migratory birds,we also apply the fourlevel system here to the detection of geomagnetic field.Geomagnetic field is one of the most useful resources of the Earth,which is closely related to human daily life and has important applications in earth science,navigation,resource exploration,national defense construction,earthquake prediction and other fields.Due to the fundamental importance of Earth’s magnetic field,it’s of great significance to measure its intensity and direction.In this paper,we propose a novel magnetic field detection scheme based on the resonance fluorescence spectrum studied in the navigation mechanism of migratory birds.In our scheme,the intensity and direction of the geomagnetic field can be obtained from the characteristics of the peaks in the fluorescence spectrum.Our findings may provide a fresh insight into magnetic field measurement,and also suggest further guidelines for the design and operation of satellite-free navigation systems based on the electrically tunable inorganic biological molecules.Moreover,we also extend the single frequency driven resonance fluorescence spectrum used in the magnetic sensing model of migratory birds to the double frequency case.Following the standard procedure of solving the resonance fluorescence spectrum,we obtain the expression of the spectrum.Then,by analyzing the structure of spectral lines under different conditions,we summarized the rule of spectral lines,and found that the rule of fluorescence spectrum driven by a single frequency can be included in the rule here as a special case.Finally,based on the obtained resonance fluorescence spectrum driven by two fields of different frequencies,we put forward a new scheme to detect the magnetic field intensity.Compared with the previous scheme which determines the magnetic field intensity by measuring the probability of observing the spectrum on resonance,the new scheme is more reliable by determining the resonance conditions of the two parameters respectively. |
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