Quantum dynamics of the avian compass
The ability of migratory birds to orient relative to the Earth's magnetic field is believed to involve a coherent superposition of two spin states of a radical electron pair. However, the mechanism by which this coherence can be maintained in the face of strong interactions with the cellular en...
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| Veröffentlicht in: | Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2014-10, Vol.90 (4), p.042710-042710, Article 042710 |
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| container_end_page | 042710 |
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| container_issue | 4 |
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| container_title | Physical review. E, Statistical, nonlinear, and soft matter physics |
| container_volume | 90 |
| creator | Walters, Zachary B |
| description | The ability of migratory birds to orient relative to the Earth's magnetic field is believed to involve a coherent superposition of two spin states of a radical electron pair. However, the mechanism by which this coherence can be maintained in the face of strong interactions with the cellular environment has remained unclear. This paper addresses the problem of decoherence between two electron spins due to hyperfine interaction with a bath of spin-1/2 nuclei. Dynamics of the radical pair density matrix are derived and shown to yield a simple mechanism for sensing magnetic field orientation. Rates of dephasing and decoherence are calculated ab initio and found to yield millisecond coherence times, consistent with behavioral experiments. |
| doi_str_mv | 10.1103/PhysRevE.90.042710 |
| format | Article |
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| ispartof | Physical review. E, Statistical, nonlinear, and soft matter physics, 2014-10, Vol.90 (4), p.042710-042710, Article 042710 |
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| source | MEDLINE; American Physical Society Journals |
| subjects | Animal Migration - physiology Animals Birds - physiology Electrons Geological Phenomena Magnetic Fields Models, Biological Orientation - physiology Quantum Theory Spatial Navigation - physiology |
| title | Quantum dynamics of the avian compass |
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