Does coherence enhance transport in photosynthesis?

Kassal, Ivan, Yuen-Zhou, Joel and Rahimi-Keshari, Saleh (2013) Does coherence enhance transport in photosynthesis?. Journal of Physical Chemistry Letters, 4 3: 362-367. doi:10.1021/jz301872b

Author Kassal, Ivan
Yuen-Zhou, Joel
Rahimi-Keshari, Saleh
Title Does coherence enhance transport in photosynthesis?
Journal name Journal of Physical Chemistry Letters   Check publisher's open access policy
ISSN 1948-7185
Publication date 2013-02-01
Year available 2013
Sub-type Article (original research)
DOI 10.1021/jz301872b
Open Access Status Not yet assessed
Volume 4
Issue 3
Start page 362
End page 367
Total pages 6
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract Recent observations of coherence in photosynthetic complexes have led to the question of whether quantum effects can occur in vivo, not under femtosecond laser pulses but in incoherent sunlight and at steady state, and, if so, whether the coherence explains the high exciton transfer efficiency. We introduce the distinction between state coherence and process coherence and show that although some photosynthetic pathways are partially coherent processes, photosynthesis in nature proceeds through stationary states. This distinction allows us to rule out several mechanisms of transport enhancement in sunlight. In particular, although they are crucial for understanding exciton transport, neither wavelike motion nor microscopic coherence, on their own, enhance the efficiency. By contrast, two partially coherent mechanisms - ENAQT and supertransfer - can enhance transport even in sunlight and thus constitute motifs for the optimization of artificial sunlight harvesting. Finally, we clarify the importance of ultrafast spectroscopy in understanding incoherent processes.
Keyword ENAQT
Exciton transport
Incoherent excitation
Quantum biology
Transport efficiency
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID CE 110001027
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
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