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We report high time-resolution measurements of photon statistics from pairsof dye molecules coupled by fluorescence resonance energy transfer (FRET). Inaddition to quantum-optical photon antibunching, we observe photon bunching ona timescale of several nanoseconds. We show by numerical simulation thatconfiguration fluctuations in the coupled fluorophore system could account forminor deviations of our data from predictions of basic Forster theory. Withfurther characterization we believe that FRET photon statistics could provide aunique tool for studying DNA mechanics on timescales from 10^-9 to 10^-3 s.Comment: 4 pages, 4 figures, submitted to Physical Review Letter

Photon Statistics and Dynamics of Fluorescence Resonance Energy Transfer