Propagating quantum coherence for a biological advantage

Details Propagating quantum coherence for a biological advantage Propagating quantum coherence for a biological advantage

2011-06-15

arxiv.org/abs/1106.2911v1

Physics

Quantum Physics

12 pages, 7 figures

Scientific paper

Photosynthetic antennas need to efficiently transfer absorbed energy through chains of pigment molecules to reaction centers, where excitations induce charge separation. Experimental evidence shows that a variety of photosynthetic systems can preserve quantum beats in this energy transfer process, even at room temperature. However, whether this quantum coherence arises in vivo and whether it has any biological function have remained unclear. Here we present a theoretical model which suggests that the creation and recreation of coherence under natural conditions is ubiquitous. Our model allows us to demonstrate a quantum coherent ratchet effect, in a design based on an energy transfer pathway in the Fenna-Matthews-Olson complex of the green sulfur bacteria. These results suggest a biological role for coherent oscillations in spatially directing energy transfer.

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