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Quantum biology revisited
Jianshu Cao (Massachusetts Institute of Technology), Richard John Cogdell (University of Glasgow), D. F. Coker (Boston University), Hong-Guang Duan (Universität Hamburg, Max Planck Institute for the Structure and Dynamics of Matter), Jürgen Hauer (TU Wien, Technical University of Munich), Ulrich Kleinekathöfer (Constructor University), Thomas L. C. Jansen (University of Groningen, Zernike Institute for Advanced Materials), Tomáš Mančal (Charles University), R. J. Dwayne Miller (Universität Hamburg, University of Toronto), Jennifer P. Ogilvie (University of Michigan), Valentyn I. Prokhorenko (Max Planck Institute for the Structure and Dynamics of Matter), Thomas Renger (Johannes Kepler University of Linz), Howe‐Siang Tan (Nanyang Technological University), Roel Tempelaar (Columbia University), Michael Thorwart (Universität Hamburg, Hamburg Centre for Ultrafast Imaging), Erling Thyrhaug (TU Wien, Technical University of Munich), Sebastian Westenhoff (University of Gothenburg), Donatas Zigmantas (Lund University)
Abstract: Photosynthesis is a highly optimized process from which valuable lessons can be learned about the operating principles in nature. Its primary steps involve energy transport operating near theoretical quantum limits in efficiency. Recently, extensive research was motivated by the hypothesis that nature used quantum coherences to direct energy transfer. This body of work, a cornerstone for the field of quantum biology, rests on the interpretation of small-amplitude oscillations in two-dimensional electronic spectra of photosynthetic complexes. This Review discusses recent work reexamining these claims and demonstrates that interexciton coherences are too short lived to have any functional significance in photosynthetic energy transfer. Instead, the observed long-lived coherences originate from impulsively excited vibrations, generally observed in femtosecond spectroscopy. These efforts, collectively, lead to a more detailed understanding of the quantum aspects of dissipation. Nature, rather than trying to avoid dissipation, exploits it via engineering of exciton-bath interaction to create efficient energy flow.