超越现实:在近期量子计算机上进行分子电子结构计算的替代单元集群Jastrow模型
Nikolay V Tkachenko1,2,3,4, Hang Ren1, Wendy M Billings1
1Department of Chemistry, University of California Berkeley CA 94720 USA nikolay.tkachenko@ou.edu whaley@berkeley.edu m_headgordon@berkeley.edu.
Chemical science
|November 21, 2025
概括
新的量子计算方法Im-uCJ和g-uCJ提供了准确和高效的分子模拟. 这些浅深的量子电路适用于近期量子设备,克服了现有的单元合集群的局限性.
科学领域:
- 量子计算是一种量子计算.
- 计算化学计算化学
- 量子模拟的量子模拟
背景情况:
- 短期量子器件需要浅深,表达性的波函数方法来模拟分子电子结构.
- 单元合集群 (UCC) 的设想虽然准确,但受到高门数的影响,这限制了它们在杂的中级量子硬件 (NISQ) 上的可行性.
- 与UCC相比,k-Fold单元集群Jastrow (uCJ) 方法提供了更好的电路扩展和深度.
研究的目的:
- 通过引入新的变体来概括k-fold uCJ框架:Im-uCJ和g-uCJ.
- 评估Im-uCJ和g-uCJ与现有的Re-uCJ替代品相比的性能和表达力.
- 为了证实这些浅层Jastrow基于量子硬件的理论的实际可行性.
主要方法:
- 引入了两个新的k-fold uCJ变体:Im-uCJ (虚拟轨道旋转) 和g-uCJ (复杂轨道旋转).
- 专注于所有uCJ变体的k=1模型,实现精确的 (无Trotter) 实现.
- 在不同的基础集中对各种分子 (H2,H3+,Be2,C2H4,C2H6,C6H6) 进行数值测试.
主要成果:
- Im-uCJ 和 g-uCJ 实现二进制门数缩放,类似于 Re-uCJ.
- 这两种新变体在捕捉电子相关性方面都表现出比Re-uCJ.CJ更大的表达力和准确性.
- uCJ模型始终保持能量误差在化学精度 (∼1 kcal mol−1) 之内.
- Im-uCJ和g-uCJ电路可以完全实现,没有Trotter分解.
结论:
- 对于近期量子硬件上的分子电子结构模拟,Im-uCJ和g-uCJ方法是有效和准确的.
- 这些基于Jastrow的概括方法为NISQ设备提供了UCC的可行替代方案.
- 这些发现证实了浅深量子电路在量子化学应用中的实际可行性和潜力.
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