在单元合集群理论中分析第四,第五和无限次序的三次激发
Zachary W Windom1, Daniel Claudino1
1Quantum Information Science Section, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
The journal of physical chemistry. A
|February 10, 2026
概括
我们开发了UCCSD[T-5],一种用于近似量子化学三次激发的新方法. 它对有效地捕捉这些效应充满希望,特别是在量子计算应用中.
科学领域:
- 量子化学 是一个量子化学.
- 计算化学计算化学
- 理论化学 理论化学
背景情况:
- 单元合集群 (UCC) 方法对于准确的电子结构计算至关重要.
- 准确地包括三次激发是至关重要的,但在计算上昂贵.
- 像UCCSD[T]和UCCSDT这样的现有方法提供了不同的准确性和成本平衡.
研究的目的:
- 引入一个新的扰动性校正,UCCSD[T-5],以近似三倍激发.
- 基准UCCSD[T-5]与UCCSD[T],UCCSDT和完整配置交互 (FCI) 相比.
- 评估量子计算中UCC方法的经典扰动性校正的潜力.
主要方法:
- 通过将第五阶多体扰动理论 (MBPT) 校正纳入UCCSD.开发了UCCSD[T-5].
- 进行了比较UCCSD[T-5],UCCSD[T],UCCSDT和FCI的基准计算.
- 分析了扰动三次激发纠正的行为.
主要成果:
- UCCSD[T]为FCI提供了最接近地面状态的能量.
- UCCSD[T-5]紧密模仿了UCCSDT的结果.
- 第五阶扰动三次数与无限阶贡献有很强的相关性.
结论:
- UCCSD[T-5]有效地捕捉了三次激发效应,为UCCSDT提供了一个计算效率高的替代方案.
- 这种方法对于资源有限的量子计算应用具有潜力.
- 经典的扰动性校正对于增强UCC方法有价值.
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