Theoretical studies indicating the presence of long-lived coherence in the radical pair system have engendered questions about its utilitarian role in the avian compass. In this paper, we investigate the role of electron spin coherence in a multinuclear radical pair system including its impact on compass sensitivity. We find that sustenance of long-lived electron spin coherence is unlikely in a multinuclear hyperfine environment. After probing the role of the hyperfine interactions in the compass, we affirm the hyperfine anisotropy to be an essential parameter for the necessary sensitivity required for the compass action. Thereby, we identify a parameter regime where the compass would exhibit good sensitivity even without sustained electron spin coherence.

表明激进对系统中存在长期相干性的理论研究引发了对其在鸟类罗盘中的功利作用的质疑。在本文中，我们研究了电子自旋相干性在多核自由基对系统中的作用，包括其对罗盘灵敏度的影响。我们发现在多核超精细环境中不太可能维持长寿命的电子自旋相干。在探讨了指南针中超精细相互作用的作用之后，我们确认超精细各向异性是指南针动作所需的必要灵敏度的基本参数。因此，我们确定了一个参数范围，即使没有持续的电子自旋相干性，罗盘也会表现出良好的灵敏度。