Optimal Initialization of a Quantum System for an Efficient Coherent Energy Transfer  

关于量子体系的高效相干能量转移的最优初始化的研究（英文）

作　　者：Zhi-hao Gong Zhou-fei Tang Jian-shu Cao Jianlan Wu 龚志浩;唐舟飞;曹建树;吴建澜(浙江大学物理系,杭州310027;麻省理工学院化学系,马萨诸塞州剑桥02139)

机构地区：[1]Department of Physics,Zhejiang University,Hangzhou 31002Z,China [2]Department of Chemistry,Massachusetts Institute of Technology,Cambridge,MA,02139,USA

出　　处：《Chinese Journal of Chemical Physics》2018年第4期421-432,613,共13页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.21573195);the Ministry of Science and Technology of China(MOST-2014CB921203)

摘　　要：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/F- scaling of the dissipation strength F. On the opposite side, optimal initial system states are conceptually constructed to suppress the 1/F-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 one- dimensional chain, and an 8-chromophore FMO protein complex.

关 键 词：Noise-enhanced energy transfer Trapping-free subspace Optimal initializa-tion Quantum dissipation 

分 类 号：O413[理学—理论物理]