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 one-dimensional chain, and an 8-chromophore FMO protein complex.
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August 2018
Research Article|
August 01 2018
Optimal initialization of a quantum system for an efficient coherent energy transfer†
Zhi-hao Gong;
Zhi-hao Gong
a
Department of Physics, Zhejiang University
, Hangzhou 310027, China
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Zhou-fei Tang;
Zhou-fei Tang
a
Department of Physics, Zhejiang University
, Hangzhou 310027, China
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Jian-shu Cao;
Jian-shu Cao
b
Department of Chemistry, Massachusetts Institute of Technology
, Cambridge, MA, 02139, USA
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Jianlan Wu
Jianlan Wu
*
a
Department of Physics, Zhejiang University
, Hangzhou 310027, China
*Author to whom Correspondence should be addressed. E-mail: jianlanwu@zju.edu.cn
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*Author to whom Correspondence should be addressed. E-mail: jianlanwu@zju.edu.cn
†
Part of the special issue for celebration of “the 60th Anniversary of University of Science and Technology of China and the 30th Anniversary of Chinese Journal of Chemical Physics”.
Chin. J. Chem. Phys. 31, 421–432 (2018)
Article history
Received:
April 14 2018
Accepted:
June 21 2018
Citation
Zhi-hao Gong, Zhou-fei Tang, Jian-shu Cao, Jianlan Wu; Optimal initialization of a quantum system for an efficient coherent energy transfer. Chin. J. Chem. Phys. 1 August 2018; 31 (4): 421–432. https://doi.org/10.1063/1674-0068/31/cjcp1804068
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