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Quantum coherence in photosynthetic complexes
Author(s) -
Calhoun Tessa R.,
Fleming Graham R.
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000856
Subject(s) - chromophore , photosynthesis , coherence (philosophical gambling strategy) , quantum , energy transfer , quantum efficiency , chemical physics , chemistry , quantum yield , photochemistry , physics , biophysics , quantum mechanics , biology , biochemistry , fluorescence
The initial steps of photosynthesis require the absorption and subsequent transfer of energy through an intricate network of pigment–protein complexes. Held within the protein scaffold of these complexes, chromophore molecules are densely packed and fixed in specific geometries relative to one another resulting in Coulombic coupling. Excitation energy transfer through these systems can be accomplished with near unity quantum efficiency [Wraight and Clayton, Biochim. Biophys. Acta 333 , 246 (1974)]. While replication of this feat is desirable for artificial photosynthesis, the mechanism by which nature achieves this efficiency is unknown. Recent experiments have revealed the presence of long‐lived quantum coherences in photosynthetic pigment–protein complexes spanning bacterial and plant species with a variety of functions and compositions. Its ubiquitous presence and wavelike energy transfer implicate quantum coherence as key to the high efficiency achieved by photosynthesis.