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We revisit critically the recent claims, inspired by quantum optics andquantum information, that there is entanglement in the biological pigmentprotein complexes, and that it is responsible for the high transportefficiency. While unexpectedly long coherence times were experimentallydemonstrated, the existence of entanglement is, at the moment, a purelytheoretical conjecture; it is this conjecture that we analyze. As demonstratedby a toy model, a similar transport phenomenology can be obtained withoutgenerating entanglement. Furthermore, we also argue that even if entanglementdoes exist, it is purely incidental and seems to plays no essential role forthe transport efficiency. We emphasize that our paper is not a proof thatentanglement does not exist in light-harvesting complexes - this would requirea knowledge of the system and its parameters well beyond the state of the art.Rather, we present a counter-example to the recent claims of entanglement,showing that the arguments, as they stand at the moment, are not sufficientlyjustified and hence cannot be taken as proof for the existence of entanglement,let alone of its essential role, in the excitation transport.

philosophical transactions - royal society. mathematical, physical and engineering sciences/philosophical transactions - royal society. mathematical, physical and engineering sciences

A critical view on transport and entanglement in models of photosynthesis