Efficient quantum simulation of open quantum dynamics at various Hamiltonians and spectral densities  

作　　者：Na-Na Zhang Ming-Jie Tao Wan-Ting He Xin-Yu Chen Xiang-Yu Kong Fu-Guo Deng Neill Lambert Qing Ai 张娜娜;陶明杰;何宛亭;陈鑫宇;孔祥宇;邓富国;Neill Lambert;艾清(Department of Physics,Applied Optics Beijing Area Major Laboratory,Beijing Normal University,Beijing,100875,China;Space Engineering University,Beijing,101416,China;Department of Physics,Tsinghua University,Beijing,100084,China;Theoretical Quantum Physics Laboratory,RIKEN Cluster for Pioneering Research,Wako-shi,Saitama,351-0198,Japan)

机构地区：[1]Department of Physics,Applied Optics Beijing Area Major Laboratory,Beijing Normal University,Beijing,100875,China [2]Space Engineering University,Beijing,101416,China [3]Department of Physics,Tsinghua University,Beijing,100084,China [4]Theoretical Quantum Physics Laboratory,RIKEN Cluster for Pioneering Research,Wako-shi,Saitama,351-0198,Japan

出　　处：《Frontiers of physics》2021年第5期47-60,共14页物理学前沿（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant Nos.11674033,11474026,and 11505007;Beijing Natural Science Foundation under Grant No.1202017;N.L.acknowledges partial support from JST PRESTO through Grant No.JPMJPR18GC.

摘　　要：Simulation of open quantum dynamics for various Hamiltonians and spectral densities are ubiquitous for studying various quantum systems.On a quantum computer,only log2N qubits are required for the simulation of an N-dimensional quantum system,hence simulation in a quantum computer can greatly reduce the computational complexity compared with classical methods.Recently,a quantum simulation approach was proposed for studying photosynthetic light harvesting[npj Quantum Inf.4,52(2018)].In this paper,we apply the approach to simulate the open quantum dynamics of various photosynthetic systems.We show that for Drude—Lorentz spectral density,the dimerized geometries with strong couplings within the donor and acceptor clusters respectively exhibit significantly improved efficiency.We also demonstrate that the overall energy transfer can be optimized when the energy gap between the donor and acceptor clusters matches the optimum of the spectral density.The effects of different types of baths,e.g.,Ohmic,sub-Ohmic,and super-Ohmic spectral densities are also studied.The present investigations demonstrate that the proposed approach is universal for simulating the exact quantum dynamics of photosynthetic systems.

关 键 词：nuclear magnetic resonance quantum simulation open quantum system 

分 类 号：O41[理学—理论物理]