论文标题
使用量子随机步道通过光合络合物进行激子传输中的量子加速
Testing quantum speedups in exciton transport through a photosynthetic complex using quantum stochastic walks
论文作者
论文摘要
光合作用是一个高效的过程，将近100％的红色光子落在叶子表面到达反应中心并转化为能量。大多数关于光合络合物的理论研究主要集中在从绿色硫细菌获得的Fenna-Matthews-Olson复合物上。据推测，量子相干性在这一非常有效的运输过程中起着重要作用。但是，最近的报告表明，通过激子传输的量子相干性可能不如通过振动过程与光合作用的连贯性那样相关。无论起源如何，关于量子相干是否会导致激子运输过程的任何加速，一直存在争议。为了解决这个问题，我们使用量子随机步行（QSW）在FMO中进行了激子传输模型，仅具有不连贯，纯粹的dephasing，并且具有脱缘性和不一致。我们发现，与QSW模型相比，具有纯粹的dephasing的QSW模型会导致激子运输的实质性加速，该模型既包括脱去和不连贯性，又有一个仅包括不连贯性，这两者都经历了减速。
Photosynthesis is a highly efficient process, nearly 100 percent of the red photons falling on the surface of leaves reach the reaction center and get transformed into energy. Most theoretical studies on photosynthetic complexes focus mainly on the Fenna-Matthews-Olson complex obtained from green-sulfur bacteria. Quantum coherence was speculated to play a significant role in this very efficient transport process. However, recent reports indicate quantum coherence via exciton transport may not be as relevant as coherence originating via vibronic processes to Photosynthesis. Regardless of the origin, there has been a debate on whether quantum coherence results in any speedup of the exciton transport process. To address this we model exciton transport in FMO using a quantum stochastic walk (QSW) with only incoherence, pure dephasing, and with both dephasing and incoherence. We find that the QSW model with pure dephasing leads to a substantial speedup in exciton transport as compared to a QSW model which includes both dephasing and incoherence and one which includes only incoherence, both of which experience slowdowns.
