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The physical basis for observed long-lived electronic coherence inphotosynthetic light-harvesting systems is identified using an analyticallysoluble model. Three physical features are found to be responsible for theirlong coherence lifetimes: i) the small energy gap between excitonic states, ii)the small ratio of the energy gap to the coupling between excitonic states, andiii) the fact that the molecular characteristics place the system in aneffective low temperature regime, even at ambient conditions. Using thisapproach, we obtain decoherence times for a dimer model with FMO parameters of$\approx$ 160 fs at 77 K and $\approx$ 80 fs at 277 K. As such, significantoscillations are found to persist for 600 fs and 300 fs, respectively, inaccord with the experiment and with previous computations. Similar goodagreement is found for PC645 at room temperature, with oscillations persistingfor 400 fs. The analytic expressions obtained provide direct insight into theparameter dependence of the decoherence time scales.

The Physical Basis for Long-lived Electronic Coherence in Photosynthetic Light Harvesting Systems