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Environment-Assisted Quantum Coherence in Photosynthetic Complex
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-11-02 00:00:00 , DOI: 10.1021/acs.jpclett.7b02480
Rajesh Dutta 1 , Biman Bagchi 1
Affiliation  

Recent experiments [Engel et al. Nature, 2007, 446, 782–786] revealed the existence of surprisingly long-lived quantum coherence in the noisy biological environment of the photosynthetic Fenna–Matthews–Olson (FMO) complex. Such coherence can clearly play an important role in facilitating efficient energy transfer. The occurrence of quantum coherence in quantum transport is also implicated in excitation transport processes in conjugated polymers [Collini et al. Science, 2009, 323, 369–373]. Even though these systems are strongly correlated, most theoretical studies invoke a Markovian approximation where the temporal correlation of bath fluctuations is neglected. We use an elegant nonperturbative method based on Kubo’s quantum stochastic Liouville equation (QSLE) to study the effects of correlated non-Markovian bath fluctuations in several different limits and find the interesting result that fluctuations not only destroy coherence but under appropriate conditions can also facilitate it. We show that temperature has the most pronounced effect in the intermediate coupling limit where it can promote transition from coherent to incoherent transfer.

中文翻译:

光合复合物中的环境辅助量子相干性

最近的实验[Engel等。自然2007446,782-786]揭示了在光合Fenna-马修斯-奥尔森(FMO)复合物的嘈杂生物环境令人惊讶的长寿命的量子相干的存在。这种连贯性显然可以在促进有效的能量转移中发挥重要作用。量子传输中量子相干的发生也与共轭聚合物的激发传输过程有关[Collini et al。科学2009年323,369–373]。即使这些系统之间具有很强的相关性,但大多数理论研究都采用了马尔可夫近似,而忽略了浴池波动的时间相关性。我们使用基于Kubo量子随机Liouville方程(QSLE)的优雅非扰动方法研究相关非马氏浴场波动在几个不同范围内的影响,发现有趣的结果是,波动不仅破坏了相干性,而且在适当的条件下也可以促进相干性。我们表明,温度在中间耦合极限中具有最明显的作用,在中间耦合极限中,温度可以促进从相干转移到非相干转移的转变。
更新日期:2017-11-03
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