Excited‐State Calculations with Quantum Monte Carlo

Excited‐State Calculations with Quantum Monte Carlo
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使用量子蒙特卡罗进行兴奋状态计算

DOI:
10.1002/9781119417774.ch8
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发表时间:
2020
期刊:
arXiv: Chemical Physics
影响因子:
--
通讯作者:
Filippi
Filippi
中科院分区:
--
文献类型:
--
作者:
Filippi

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量子蒙特卡罗方法是近似随机求解薛定谔方程的第一原理方法。与传统的量子化学方法相比,它们提供了重要的优势,例如能够处理各种各样的多体波函数,粒子数量的有利缩放,以及特别适合现代大规模并行计算机的算法的内在并行性。在这一章中,我们集中在两个量子蒙特卡罗方法最广泛地用于电子结构问题,即变分和扩散蒙特卡罗方法。我们给予特别关注的波函数,一个具有挑战性的和重要的一步,以实现在地面和激发态的准确结果的优化技术的最新进展。最后,我们概述了分子系统激发态计算的现状,展示了量子蒙特卡罗方法在这一应用领域的潜力。
Quantum Monte Carlo methods are first‐principle approaches that approximately solve the Schrödinger equation stochastically. As compared to traditional quantum chemistry methods, they offer important advantages such as the ability to handle a large variety of many‐body wave functions, the favorable scaling with the number of particles, and the intrinsic parallelism of the algorithms which are particularly suitable to modern massively parallel computers. In this chapter, we focus on the two quantum Monte Carlo approaches most widely used for electronic structure problems, namely, the variational and diffusion Monte Carlo methods. We give particular attention to the recent progress in the techniques for the optimization of the wave function, a challenging and important step to achieve accurate results in both the ground and the excited state. We conclude with an overview of the current status of excited‐state calculations for molecular systems, demonstrating the potential of quantum Monte Carlo methods in this field of applications.
扩散量子蒙特卡罗中无偏期望值的高效计算
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