SPAHM(a,b):从猜测哈密尔顿的密度信息编码到量子机器学习表示中
Ksenia R Briling1, Yannick Calvino Alonso1, Alberto Fabrizio1,2
1Laboratory for Computational Molecular Design, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland.
Journal of chemical theory and computation
|January 16, 2024
概括
我们开发了新的分子表示,近似哈密尔顿矩阵 (SPAHM) 的光谱,用于基于内核的回归. 这些先进的方法提高了对具有挑战性的分子系统的预测,包括充电和兴奋状态.
科学领域:
- 计算化学的计算化学
- 机器学习 机器学习
- 量子化学 是一个量子化学.
背景情况:
- 传统的分子表征与充电和兴奋状态系统作斗争.
- 轻量级的一电子哈密尔顿数为分子描述器提供了一个有希望的基础.
- 估计的哈密尔顿矩阵 (SPAHM) 的光谱以前是使用自值引入的.
研究的目的:
- 将SPAHM框架扩展到本地和可转移的分子表示.
- 在各种化学数据集上评估这些新表示的性能和效率.
- 解决现有方法在预测复杂分子系统的属性的局限性.
主要方法:
- 使用一个电子密度矩阵开发SPAHM(a,b).
- 原子密度和键密度的构造重叠指纹.
- 对QM7数据集 (有机分子) 和激发状态的甲色素染料的评估.
- 与最先进的分子表征进行比较.
主要成果:
- SPAHM(a,b) 成功生成本地和可转移的分子表示.
- 新的表示表现在具有挑战性的预测任务中表现出高性能.
- SPAHM(a,b) 优于充电的开物种和 π 结合系统的现有方法.
结论:
- 扩展的SPAHM(a,b) 表示方法比传统方法提供了显著的改进.
- 这些新型描述符对于基于内核的回归是有效的,特别是对于复杂的分子性质.
- SPAHM(a,b) 为计算化学中的分子性质预测提供了强大的和高效的方法.
相关概念视频
The Quantum-Mechanical Model of an Atom
42.3K
Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
42.3K
Quantum Numbers
34.8K
It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
34.8K
State Space Representation
209
The frequency-domain technique, commonly used in analyzing and designing feedback control systems, is effective for linear, time-invariant systems. However, it falls short when dealing with nonlinear, time-varying, and multiple-input multiple-output systems. The time-domain or state-space approach addresses these limitations by utilizing state variables to construct simultaneous, first-order differential equations, known as state equations, for an nth-order system.
Consider an RLC circuit, a...
Consider an RLC circuit, a...
209
Vector Representation of Complex Numbers
125
Complex numbers, represented in Cartesian coordinates, can also be visualized as vectors. These vectors can be expressed in polar form, emphasizing their magnitude and angle. When a complex number is input into a function, the output is another complex number, highlighting the function's zero point from which the vector representation can originate.
Consider a function defined as the product of the complex factors in the numerator divided by the product of the complex factors in the...
Consider a function defined as the product of the complex factors in the numerator divided by the product of the complex factors in the...
125
The Representativeness Heuristic
15.8K
The representative heuristic describes a biased way of thinking, in which you unintentionally stereotype someone or something. For example, you may assume that your professors spend their free time reading books and engaging in intellectual conversation, because the idea of them spending their time playing volleyball or visiting an amusement park does not fit in with your stereotypes of professors.
15.8K
The Uncertainty Principle
23.4K
Werner Heisenberg considered the limits of how accurately one can measure properties of an electron or other microscopic particles. He determined that there is a fundamental limit to how accurately one can measure both a particle’s position and its momentum simultaneously. The more accurate the measurement of the momentum of a particle is known, the less accurate the position at that time is known and vice versa. This is what is now called the Heisenberg uncertainty principle. He...
23.4K


