Quantum coherence enhancement by the chirality-induced spin selectivity effect in the radical-pair mechanism*

Avian magnetoreception is the ability of migratory birds to navigate using the Earth's magnetic field. The underlying biophysical mechanism relies on the spin dynamics of radical pairs (RP). The medium in which this reaction occurs is chiral that results in Chirality-Induced Spin Selectivity (CISS) effect affecting radical pair creation and recombination. In our work, we have studied the influence of CISS on the compass sensitivity and quantum coherence. We find that it enhances sensitivity and counters dipolar interaction's adverse effects. We observe significant compass sensitivity even under spin relaxation. Further, we studied CISS's impact on quantum coherence within the RP system. Interestingly, global quantum coherence correlates strongly with the compass signaling state yield. Our study considered simplified and comprehensive models, including up to eight nuclei. In the future, we plan to investigate the structural aspects of the medium during electron transfer, offering deeper insights into the overall radical pair mechanism. The study highlights the importance of harnessing the CISS effect in artificial quantum systems to achieve sustained quantum coherence.