Highly efficient energy excitation transfer in light-harvesting complexes: The fundamental role of noise-assisted transport

被引:542
作者
Caruso, F. [1 ,2 ]
Chin, A. W. [3 ]
Datta, A. [1 ,2 ]
Huelga, S. F. [3 ]
Plenio, M. B. [1 ,2 ,4 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Inst Math Sci, London SW7 2PG, England
[2] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, QOLS, London SW7 2BW, England
[3] Univ Hertfordshire, Dept Phys Astron & Math, Quantum Phys Grp, Hatfield AL10 9AB, Herts, England
[4] Univ Ulm, Inst Theoret Phys, D-89069 Ulm, Germany
基金
英国工程与自然科学研究理事会;
关键词
DYNAMICS; ENTANGLEMENT; COHERENCE; MIGRATION;
D O I
10.1063/1.3223548
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Excitation transfer through interacting systems plays an important role in many areas of physics, chemistry, and biology. The uncontrollable interaction of the transmission network with a noisy environment is usually assumed to deteriorate its transport capacity, especially so when the system is fundamentally quantum mechanical. Here we identify key mechanisms through which noise such as dephasing, perhaps counter intuitively, may actually aid transport through a dissipative network by opening up additional pathways for excitation transfer. We show that these are processes that lead to the inhibition of destructive interference and exploitation of line broadening effects. We illustrate how these mechanisms operate on a fully connected network by developing a powerful analytical technique that identifies the invariant (excitation trapping) subspaces of a given Hamiltonian. Finally, we show how these principles can explain the remarkable efficiency and robustness of excitation energy transfer from the light-harvesting chlorosomes to the bacterial reaction center in photosynthetic complexes and present a numerical analysis of excitation transport across the Fenna Matthew-Olson complex together with a brief analysis of its entanglement properties. Our results show that, in general, it is the careful interplay of quantum mechanical features and the unavoidable environmental noise that will lead to an optimal system performance. (C) 2009 The American Physical Society. [doi:10.1063/1.3223548]
引用
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页数:15
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