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Population and Entanglement Dynamics in Light Harvesting Complex II (LH2) | | Shu-Hao Yeh
; Jing Zhu
; Sabre Kais
; | | Date: |
24 Apr 2012 | | Abstract: | 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. | | Source: | arXiv, 1204.5262 | | Services: | Forum | Review | PDF | Favorites | |
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