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Optimal Initialization of a Quantum System for an Efficient Coherent Energy Transfer
Zhi-hao Gong,Zhou-fei Tang,Jian-shu Cao,Jianlan Wu*
Author NameAffiliationE-mail
Zhi-hao Gong Department of Physics, Zhejiang University, Hangzhou 310027, China  
Zhou-fei Tang Department of Physics, Zhejiang University, Hangzhou 310027, China  
Jian-shu Cao Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA  
Jianlan Wu* Department of Physics, Zhejiang University, Hangzhou 310027, China jianlanwu@zju.edu.cn 
Abstract:
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.
Key words:  Noise-enhanced energy transfer  Trapping-free subspace  Optimal initialization  Quantum dissipation
FundProject:The work reported was supported by the National Natural Science Foundation of China (No.21573195) and the Ministry of Science and Technology of China (MOST-2014CB921203).
关于量子体系的高效相干能量转移的最优初始化的研究
龚志浩,唐舟飞,曹建树,吴建澜*
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DOI:10.1063/1674-0068/31/cjcp1804068
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