Optimal initialization of a quantum system for an efficient coherent energy transfer
Optimal initialization of a quantum system for an efficient coherent energy transfer
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DOI：
10.1063/1674-0068/31/cjcp1804068
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发表时间：
2018-08
影响因子：
1
通讯作者：
Zhihao Gong;Zhoufei Tang;Jianshu Cao;Jianlan Wu
中科院分区：
文献类型：
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作者：
Zhihao Gong;Zhoufei Tang;Jianshu Cao;Jianlan Wu
对于能量转移网络，激发电子能量的不可逆耗尽通过有效流入外部能量汇或无效衰减发生。在衰减速率较小的情况下，能量转移效率由激发能量在被捕获在阱中之前的平均寿命定量地反映，其中省略了衰减过程。在弱耗散区，基于久期Redfield方程，在激子布居子空间内分析了俘获时间。得到了噪声增强能量转移的要求，其中俘获时间遵循耗散强度的精确或近似1/Γ标度。在另一方面，从概念上构造最佳的初始系统状态，以抑制捕获时间的1/Γ标度，并最大化相干传输效率。我们的理论在四个模型中得到了数值验证，包括一个有偏见的两个网站的系统，一个对称的三个网站的分支系统，一个均匀的一维链，和一个8-生色团FMO蛋白质复合物。
For an energy transfer network, the irreversible depletion of excited electron energy occurs through either an efficient flow into an outer energy sink or an inefficient decay. With a small decay rate, the energy transfer efficiency is quantitatively reflected by the average life time of excitation energy before being trapped in the sink where the decay process is omitted. In the weak dissipation regime, the trapping time is analyzed within the exciton population subspace based on the secular Redfield equation. The requirement of the noise-enhanced energy transfer is obtained, where the trapping time follows an exact or approximate 1/Γ-scaling of the dissipation strength Γ. On the opposite side, optimal initial system states are conceptually constructed to suppress the 1/Γ-scaling of the trapping time and maximize the coherent transfer efficiency. Our theory is numerically testified in four models, including a biased two-site system, a symmetric three-site branching system, a homogeneous onedimensional chain, and an 8-chromophore FMO protein complex.