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arXiv 2310.13752physics.chem-phquant-ph
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使用基态形式论的激发态降维

Excited-State Downfolding Using Ground-State Formalisms

Nicholas P. Bauman

AI总结:

本研究提出利用非Aufbau参考行列式的基态降维形式论来描述双重激发态,构建特定态有效哈密顿量,在活性空间对角化后获得了与高级CC方法相当的激发能,为量子计算在激发态化学中的应用铺平道路。

摘要:

降维耦合簇(CC)技术是降低多体量子问题维度的有力工具。本研究探讨如何利用非Aufbau参考行列式,通过基态降维形式论来瞄准激发态,为量子计算在激发态化学中的应用铺平道路。本工作聚焦于双重激发态,对于这类状态,除非包含高于双重激发的成分,否则标准的运动方程CC方法难以准确描述。降维技术产生了特定于态的有效哈密顿量,这些哈密顿量在各自活性空间中对角化后,可提供与高级CC方法相当的基态和激发态总能量(从而得到激发能)。本文通过H$_{2}$、Methylene、Formaldehyde和Nitroxyl的双重激发态检验了该方法的性能。

英文摘要:

Downfolding coupled cluster (CC) techniques are powerful tools for reducing the dimensionality of many-body quantum problems. This work investigates how ground-state downfolding formalisms can target excited states using non-Aufbau reference determinants, paving the way for applications of quantum computing in excited-state chemistry. This study focuses on doubly excited states for which canonical equation-of-motion CC approaches struggle to describe unless one includes higher-than-double excitations. The downfolding technique results in state-specific effective Hamiltonians that, when diagonalized in their respective active spaces, provide ground- and excited-state total energies (and therefore excitation energies) comparable to high-level CC methods. The performance of this procedure is examined with doubly excited states of H$_{2}$, Methylene, Formaldehyde, and Nitroxyl.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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