Environment-assisted quantum walks in photosynthetic energy transfer.

@article{Mohseni2008EnvironmentassistedQW,
  title={Environment-assisted quantum walks in photosynthetic energy transfer.},
  author={Masoud Mohseni and Patrick Rebentrost and Seth Lloyd and Al{\'a}n Aspuru‐Guzik},
  journal={The Journal of chemical physics},
  year={2008},
  volume={129 17},
  pages={
          174106
        }
}
Energy transfer within photosynthetic systems can display quantum effects such as delocalized excitonic transport. Recently, direct evidence of long-lived coherence has been experimentally demonstrated for the dynamics of the Fenna-Matthews-Olson (FMO) protein complex [Engel et al., Nature (London) 446, 782 (2007)]. However, the relevance of quantum dynamical processes to the exciton transfer efficiency is to a large extent unknown. Here, we develop a theoretical framework for studying the role… 

Figures from this paper

Environment-Assisted Quantum Coherence in Photosynthetic Complex.
TLDR
It is found that fluctuations not only destroy coherence but under appropriate conditions can also facilitate it and it is shown that temperature has the most pronounced effect in the intermediate coupling limit where it can promote transition from coherent to incoherent transfer.
Nature does not rely on long-lived electronic quantum coherence for photosynthetic energy transfer
TLDR
2D spectroscopy of the excitation energy transfer in the FMO protein is revisited and it is shown that the optical 2D photon echo spectra of this complex at ambient temperature in aqueous solution do not provide evidence of any long-lived electronic quantum coherence, but confirm the orthodox view of rapidly decaying electronic quantumCoherence on a timescale of 60 fs.
Interplay between Dephasing and Geometry and Directed Heat Flow in Exciton Transfer Complexes
The striking efficiency of energy transfer in natural photosynthetic systems and the recent evidence of long-lived quantum coherence in biological light harvesting complexes has triggered much
Quantum coherence explored at the level of individual light-harvesting complexes
Quantum mechanical effects in biological processes, such as natural photosynthesis, are intriguing and lively debated issues. The initial steps of photosynthesis comprise the absorption of sunlight
Theoretical examination of quantum coherence in a photosynthetic system at physiological temperature
TLDR
The numerical results reveal that quantum wave-like motion persists for several hundred femtoseconds even at physiological temperature, and suggest that the FMO complex may work as a rectifier for unidirectional energy flow from the peripheral light-harvesting antenna to the reaction center complex by taking advantage of quantum coherence and the energy landscape of pigments tuned by the protein scaffold.
Energy transfer and quantum correlation dynamics in FMO light-harvesting complex
ABSTRACT The dynamics of energy transfer in Fenna–Matthews–Olson (FMO) light-harvesting complex interacting with a phonon bath is investigated. In this contribution, by considering the phonon bath as
Driving the Dephasing Assisted Quantum Transport
Nontrivial quantum effects in biological systems are of high interest among physicists over the past decade. They allow for information and energy to be exchanged with near-unity efficiency despite
...
...

References

SHOWING 1-10 OF 128 REFERENCES
Evidence for wavelike energy transfer through quantum coherence in photosynthetic systems
TLDR
Previous two-dimensional electronic spectroscopy investigations of the FMO bacteriochlorophyll complex are extended, and direct evidence is obtained for remarkably long-lived electronic quantum coherence playing an important part in energy transfer processes within this system is obtained.
Efficiency of energy transfer in a light-harvesting system under quantum coherence
We investigate the role of quantum coherence in the efficiency of excitation transfer in a ring-hub arrangement of interacting two-level systems, mimicking a light-harvesting antenna connected to a
Wave-function approach to dissipative processes in quantum optics.
TLDR
An alternative approach using a wave-function treatment to describe the atomic system and it is shown that this treatment is equivalent to the standard density matrix approach leading to the OBE's.
Coherence Dynamics in Photosynthesis: Protein Protection of Excitonic Coherence
TLDR
The results suggest that correlated protein environments preserve electronic coherence in photosynthetic complexes and allow the excitation to move coherently in space, enabling highly efficient energy harvesting and trapping in photosynthesis.
Energy-transfer dynamics in the LHCII complex of higher plants: Modified redfield approach
We have modeled energy-transfer dynamics in the peripheral plant light-harvesting complex LHCII using both standard Redfield theory and its modification for the case of strong exciton -phonon
α-Helices direct excitation energy flow in the Fenna–Matthews–Olson protein
TLDR
A combined quantum chemical/electrostatic approach to compute site energies of the Fenna–Matthews–Olson protein results in optical spectra that are in quantitative agreement with experiment and reveals an unexpectedly strong influence of the backbone of two α-helices.
Long-range resonance energy transfer in molecular systems.
  • G. Scholes
  • Chemistry, Physics
    Annual review of physical chemistry
  • 2003
TLDR
This review covers Förster theory for donor-acceptor pairs and electronic coupling for singlet-singlet, triplet-triplet, and superexchange-mediated energy transfer and includes the transition density picture of Coulombic coupling as well as electronic coupling between molecular aggregates (excitons).
Coherent exciton transport in dendrimers and continuous-time quantum walks.
TLDR
For the (space) average of the quantum mechanical probability to be still or to be again at the initial site, a simple lower bound is obtained, based on the Cauchy-Schwarz inequality, which depends only on the eigenvalue spectrum of the Hamiltonian.
Multichromophoric Förster resonance energy transfer from b800 to b850 in the light harvesting complex 2: evidence for subtle energetic optimization by purple bacteria.
TLDR
Evidence is provided that the bacterial system utilizes the quantum mechanical coherence among the multiple chromophores within the B850 in a constructive way so as to achieve efficient energy transfer from B800 to B850.
The effects of connectivity, coherence, and trapping on energy transfer in simple light-harvesting systems studied using the Haken-Strobl model with diagonal disorder.
TLDR
There exists an optimum combination of trapping time and coherence time, which will give the most rapid population transfer to the trap, and in the coherent regime, population trapping in a finite system can be suppressed by quantum interference effects.
...
...