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Title: Quantum entanglement in photosynthetic light-harvesting complexes

Abstract

Light harvesting components of photosynthetic organisms are complex, coupled, many-body quantum systems, in which electronic coherence has recently been shown to survive for relatively long time scales despite the decohering effects of their environments. Within this context, we analyze entanglement in multi-chromophoric light harvesting complexes, and establish methods for quantification of entanglement by presenting necessary and sufficient conditions for entanglement and by deriving a measure of global entanglement. These methods are then applied to the Fenna-Matthews-Olson (FMO) protein to extract the initial state and temperature dependencies of entanglement. We also show that while FMO in natural conditions largely contains bipartite entanglement between dimerized chromophores, a small amount of long-range and multipartite entanglement exists even at physiological temperatures. This constitutes the first rigorous quantification of entanglement in a biological system. Finally, we discuss the practical utilization of entanglement in densely packed molecular aggregates such as light harvesting complexes.

Authors:
 [1];  [2];  [2];  [1]
  1. Univ. of California, Berkeley, CA (United States). Berkeley Center for Quantum Information and Computation and Dept. of Chemistry
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Bioscience Division
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; Defense Advanced Research Projects Agency (DARPA); Japan Society for the Promotion of Science (JSPS)
OSTI Identifier:
1465468
Grant/Contract Number:  
AC02-05CH11231; N66001-09-1-2026; AC03-76SF000098
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 6; Journal Issue: 6; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Sarovar, Mohan, Ishizaki, Akihito, Fleming, Graham R., and Whaley, K. Birgitta. Quantum entanglement in photosynthetic light-harvesting complexes. United States: N. p., 2010. Web. doi:10.1038/nphys1652.
Sarovar, Mohan, Ishizaki, Akihito, Fleming, Graham R., & Whaley, K. Birgitta. Quantum entanglement in photosynthetic light-harvesting complexes. United States. https://doi.org/10.1038/nphys1652
Sarovar, Mohan, Ishizaki, Akihito, Fleming, Graham R., and Whaley, K. Birgitta. Sun . "Quantum entanglement in photosynthetic light-harvesting complexes". United States. https://doi.org/10.1038/nphys1652. https://www.osti.gov/servlets/purl/1465468.
@article{osti_1465468,
title = {Quantum entanglement in photosynthetic light-harvesting complexes},
author = {Sarovar, Mohan and Ishizaki, Akihito and Fleming, Graham R. and Whaley, K. Birgitta},
abstractNote = {Light harvesting components of photosynthetic organisms are complex, coupled, many-body quantum systems, in which electronic coherence has recently been shown to survive for relatively long time scales despite the decohering effects of their environments. Within this context, we analyze entanglement in multi-chromophoric light harvesting complexes, and establish methods for quantification of entanglement by presenting necessary and sufficient conditions for entanglement and by deriving a measure of global entanglement. These methods are then applied to the Fenna-Matthews-Olson (FMO) protein to extract the initial state and temperature dependencies of entanglement. We also show that while FMO in natural conditions largely contains bipartite entanglement between dimerized chromophores, a small amount of long-range and multipartite entanglement exists even at physiological temperatures. This constitutes the first rigorous quantification of entanglement in a biological system. Finally, we discuss the practical utilization of entanglement in densely packed molecular aggregates such as light harvesting complexes.},
doi = {10.1038/nphys1652},
journal = {Nature Physics},
number = 6,
volume = 6,
place = {United States},
year = {2010},
month = {4}
}

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