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arXiv 1304.3452physics.bio-phquant-ph
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环境诱导的各向异性和鸟类罗盘中自由基对机制的敏感性

Environment-induced anisotropy and the sensitivity of the radical pair mechanism in the avian compass

Alejandro Carrillo, Marcio F. Cornelio, Marcos C. de Oliveira

摘要:

多年来的一些实验表明,地球的磁场对鸟类迁徙的方向至关重要。对这种取向最有希望的解释是光刺激自由基对(RP)机制。为了定义定向任务的参考系,自由基必须具有固有的各向异性。我们表明,这种各向异性,因此在模型中的纠缠,是没有必要的指南针的正常运作。经典相关的RP的初始条件,进行快速退相干过程,能够提供所需的各向异性。即使是一个失相的环境也可以为指南针提供工作所必需的框架,并且还意味着系统中任何量子相关性的快速衰减而不损害定向能力。这一事实大大扩展了RP机制的适用范围,为实验搜索提供了更多的元素。

英文摘要:

Several experiments over the years have shown that the Earth's magnetic field is essential for orientation in birds migration. The most promising explanation for this orientation is the photo-stimulated radical pair (RP) mechanism. In order to define a reference frame for the orientation task radicals must have an intrinsic anisotropy. We show that this kind of anisotropy, and consequently the entanglement in the model, are not necessary for the proper functioning of the compass. Classically correlated initial conditions for the RP, subjected to a fast decoherence process, are able to provide the anisotropy required. Even a dephasing environment can provide the necessary frame for the compass to work, and also implies fast decay of any quantum correlation in the system without damaging the orientation ability. This fact significantly expands the range of applicability of the RP mechanism providing more elements for experimental search.

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