大小一致性和轨道不变性问题由VQE-UCCSD与FMO方案计算所揭示
Kenji Sugisaki1,2,3, Tatsuya Nakano4, Yuji Mochizuki5,6
1Graduate School of Science and Technology, Keio University, Kawasaki, Japan.
Journal of computational chemistry
|May 25, 2024
概括
局部化分子轨道使用碎片分子轨道 (FMO) 方法与变量量子自溶解器 (VQE) 合集群改进了量子化学计算. 对于更大的量子系统,GPU加速显著加快了这些模拟.
科学领域:
- 量子化学 是一个量子化学.
- 计算化学的计算化学
- 量子计算算法 量子计算算法
背景情况:
- 碎片分子轨道 (FMO) 方法在量子化学计算中提供了浅量子电路的潜力.
- 电子相关性计算对于准确的分子建模至关重要.
- 变量量子Eigensolver (VQE) 结合单元合集群单双 (UCCSD) 是一个有前途的量子算法.
研究的目的:
- 调查GPU加速量子模拟器在FMO计算中的电子相关部分的应用.
- 通过使用规范和局部分子轨道 (MO) 集来评估VQE-UCCSD的性能.
- 评估Trotter误差对尺寸一致性和轨道不变性的影响.
主要方法:
- 使用GPU加速的量子模拟器 (cuQuantum) 进行VQE-UCCSD计算.
- 在使用STO-3G基础集的结系统 (FH) x和 (FH) x-H2O上进行了计算.
- 用正规和本地化MO集获得的结果进行比较.
主要成果:
- 与正规的MO集相比,局部化的MO集产生了更好的结果,特别是对于 (FH) x-H2O系统.
- GPU 加速提供了相当大的加速度,从6.7到7.7倍为18量子比特系统.
- 该研究检查了Trotter错误的背景下的大小一致性和轨道不变性.
结论:
- 局部化的MO对于VQE-UCCSD FMO计算是有利的,提高了准确性.
- 对于实现更大的分子系统的高效量子模拟,GPU加速至关重要.
- 这些发现有助于开发用于计算化学的实用量子算法.
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