通过对变量量子激发状态解决器进行直角约束轨道优化来减少量子比特数量
Joel Bierman1, Yingzhou Li2,3,4, Jianfeng Lu1,5,6
1Department of Physics, Duke University, Durham, North Carolina 27708, United States.
Journal of chemical theory and computation
|April 10, 2024
概括
我们开发了一种新的量子计算方法,用于准确的激发状态计算. 这种方法使用更少的量子比特,并超越了分子电子结构问题的传统方法.
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:
- 精确计算电子激发状态对于理解分子性质和反应至关重要.
- 近期的量子计算机为推进计算化学提供了机会,但需要高效的算法.
研究的目的:
- 提出一种新的状态平均轨道优化方案,以提高量子计算机激发状态的准确性.
- 开发一种方法,克服传统轨道优化技术的局限性.
主要方法:
- 轨道旋转的参数化作为一个一般的部分单元矩阵.
- 在没有膨胀近似的情况下,使用直角约束梯度投影方法优化状态平均能量.
主要成果:
- 拟议的方法实现了比固定基础更高的准确性,对于分子系统的完整CI (FCI).
- 证明了显著的量子位减少,例如,与H2的FCI精度相匹配,H2的FCI精度为14个量子位,而不是56个量子位.
结论:
- 状态平均轨道优化方案为量子硬件上的激发状态计算提供了更准确和资源高效的方法.
- 这种方法对推进量子化学模拟有前途.
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