Shu-Hao Yeh, Jing Zhu, Sabre Kais
The electronic excitation population and entanglement dynamics in the chromophores of photosynthetic light harvesting complex 2 (LH2) B850 ring from purple bacteria (Rhodopseudomonas acidophila) have been studied and analyzed theoretically at both physiological and cryogenic temperature. Similar to the well-studied Fenna-Matthews-Olson (FMO) protein, oscillations of excitation population and pairwise entanglement are observed in LH2 by using a scaled hierarchical equation of motion (HEOM) approach. However, this oscillation time (300 fs) is much shorter compared to the FMO protein (650 fs) at cryogenic temperature. The environment and high temperature are found to enhance the propagation speed of exciton wave packet but shorten the coherence time and suppress both oscillation amplitude of concurrence and population. The calculation of bipartite entanglement between chromophore electronic excitation shows the existence of a long-lived entanglement in this system, illustrates that such quantum effect could survive even in a noisy biological environment.
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http://arxiv.org/abs/1204.5262
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