In recent years, experiments (Fleming group in Berkeley) showed that
excitonic energy transfer in photosynthesis is quantum coherent for
several hundreds of femto-seconds and thus for a big part of the total
transfer time. I show how coherence can survive despite strongly coupled
environmental fluctuations, namely due to two features of the
fluctuation spectra: spatial correlations and/or suppression of fast
fluctuations. These findings raise many questions regarding the use of
quantum coherence by nature in living things.
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