相关实验视频
Updated: Jan 16, 2026

06:42
Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
9.6K
辅助场量子蒙特卡洛方法与高级度零试验波函数
Yuichiro Yoshida1, Luca Erhart1, Takuma Murokoshi1
1Center for Quantum Information and Quantum Biology, The University of Osaka, 1-2 Machikaneyama, Toyonaka, Osaka 560-0043, Japan.
Journal of chemical theory and computation
|September 26, 2025
概括
双占配置交互 (DOCI) 与无相辅助场量子蒙特卡罗 (ph-AFQMC) 结合,为准确的量子化学计算提供了具有成本效益的方法. 这种方法在捕捉静态和动态相关性方面表现出色,尽管它面临着强烈相关系系统的局限性.
科学领域:
- 量子化学 是一个量子化学.
- 计算物理 计算物理
- 材料科学 材料科学 材料科学
背景情况:
- 准确的量子化学计算对于理解化学系统至关重要.
- 像完整主动空间 (CAS) 配置交互 (CI) 这样的传统方法在计算上昂贵.
- 开发有效的方法来捕捉静态和动态电子相关性是一个关键的挑战.
研究的目的:
- 引入和评估一种新的方法,将双重占用配置交互 (DOCI) 与无相辅助场量子蒙特卡洛 (ph-AFQMC) 结合起来.
- 评估这种方法的性能,包括一个轨道优化的变体 (OO-DOCI),用于各种化学系统.
- 探索基于DOCI的ph-AFQMC的潜力,作为用于多引用计算的CAS方法的计算效率高的替代方案.
主要方法:
- 在ph-AFQMC框架内使用DOCI波函数作为试验波函数.
- 采用一个轨道优化的DOCI (OO-DOCI) 来提高准确性.
- 在水中的OH键破裂,聚合物添加剂,二元碳和系统等系统上测试该方法.
主要成果:
- OO-DOCI-AFQMC方法实现了高精度,可与基于CAS的ph-AFQMC相提并论,用于中度相关性系统.
- 在特定情况下,性能与合集群方法密切匹配或超越.
- 对于强烈相关的系统,准确性下降,这表明这些场景的资历为零空间的局限性.
结论:
- 基于DOCI和OO-DOCI的ph-AFQMC为准确的多引用计算提供了一种计算可处理的方法.
- 该方法有效地捕捉了许多系统的静态和动态相关性,降低了与CAS方法相关的成本.
- 对于强烈相关的系统,需要进一步开发,可能涉及在扩展空间中的试验波函数.
相关概念视频
Quantum Numbers
49.3K
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.
49.3K
The Quantum-Mechanical Model of an Atom
56.6K
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.
56.6K
Maxwell-Boltzmann Distribution: Problem Solving
2.8K
Individual molecules in a gas move in random directions, but a gas containing numerous molecules has a predictable distribution of molecular speeds, which is known as the Maxwell-Boltzmann distribution, f(v).
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
This distribution function f(v) is defined by saying that the expected number N (v1,v2) of particles with speeds between v1 and v2 is given by
2.8K
Fermi Level Dynamics
655
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
655
The de Broglie Wavelength
33.0K
In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
33.0K
Hybridization of Atomic Orbitals II
48.0K
sp3d and sp3d 2 Hybridization
48.0K

