基于变量量子自溶解和通缩的多体扩展用于动态相关性
Enhua Xu1, Yuma Shimomoto1, Seiichiro L Ten-No1
1Graduate School of System Informatics, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo 657-8501, Japan.
本研究介绍了一种使用多体膨胀 (MBE) 来计算分子能量的量子计算方法. 该方法准确地确定了基态和兴奋状态,显示了复杂化学系统的前景.
科学领域:
- 量子计算是一种量子计算.
- 计算化学计算化学
- 电子结构理论 电子结构理论
背景情况:
- 精确计算分子电子结构对于理解化学性质和反应至关重要.
- 现有的方法面临着与强烈相关的系统和计算资源需求的挑战.
- 多体扩展 (MBE) 提供了基于碎片的方法来简化复杂的电子结构计算.
研究的目的:
- 开发和验证基于量子计算的多体膨胀 (MBE) 框架,用于计算地面和激发状态能量.
- 通过使用变量量子自溶解器和通缩算法,评估拟议的MBE方法的准确性和资源效率.
- 调查近似和噪声对分子系统能量计算的影响.
主要方法:
- 利用多体扩张 (MBE) 将电子结构分解成可管理的碎片.
- 采用变量量子自溶解器 (VQE) 和通缩算法来解决碎片能量.
- 嵌入近似,例如单元合集群单双 (UCCSD) 运算符的部分概括,以节省量子资源.
主要成果:
- 成功计算了包括LiH,CH+和H2O在内的分子的基态和激发状态能量.
- 研究了H2O和N2中断键的潜在能量表面,证明了可靠的描述.
- 模型模拟突出了低级MBE碎片精确能量估计的关键重要性,特别是在射击噪声方面.
结论:
- 量子增强的MBE方法为确定分子能量提供了一种可靠的方法,包括对强相关系系统的确定.
- 拟议的近似方法有效地节约了量子资源,同时保持了准确性.
- 精确的能量计算对于MBE在量子化学中的成功应用至关重要.
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