Simulation of a spin-boson model by iterative optimization of a parametrized quantum circuit

被引:1
|
作者
Nishi, Takanori [1 ]
Yamanouchi, Kaoru [1 ]
机构
[1] Univ Tokyo, Inst Attosecond Laser Facil, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1130033, Japan
来源
AVS QUANTUM SCIENCE | 2024年 / 6卷 / 02期
关键词
ERROR MITIGATION; ALGORITHMS;
D O I
10.1116/5.0193981
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Time evolution of the populations of spin states coupled with bosons, which can be a model of photosynthetic excitation energy transfer of dye molecules surrounded by proteins, is simulated using the projected-variational quantum dynamics algorithm. By a transformation of the Hamiltonian describing the spin-boson model into the one-dimensional nearest-neighbor form, it is shown that the spin-boson model can be simulated using the sequential ansatz even if a quantum computer has limited connectivity. The optimization of the parametrized quantum circuits is performed by the gradient descent method on a classical computer using the automatic differentiation, and the population of the spins is simulated on a noisy intermediate-scale quantum computer. The error originating from the quantum computing is mitigated by the Clifford data regression, in which the noise channel is estimated using the data obtained from all the time steps.
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页数:9
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