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Exciton transfer along a polymer is essential for many biological processes,for instance light harvesting in photosynthetic biosystems. Here we apply a newwitness of non-classicality to this phenomenon, to conclude that, if an excitoncan mediate the coherent quantum evolution of a photon, then the exciton isnon-classical. We then propose a general qubit model for the quantum transferof an exciton along a polymer chain, also discussing the effects ofenvironmental decoherence. The generality of our results makes them idealcandidates to design new tests of quantum features in complex bio-molecules.

Temporal witnesses of non-classicality in a macroscopic biological system