A Semiclassical Framework for Mixed Quantum Classical Dynamics

TL;DR

This paper introduces a modified Filinov filtration method within a semiclassical framework to improve mixed quantum-classical simulations, balancing accuracy and computational efficiency for complex chemical systems.

Contribution

It presents a novel semiclassical approach using Modified Filinov filtration to enhance mixed quantum-classical dynamics simulations.

Findings

Enables efficient simulation of high-dimensional chemical reactions.

Balances quantum accuracy with classical computational scaling.

Provides a unified framework for mixed quantum-classical dynamics.

Abstract

Semiclassical approximations for quantum dynamic simulations in complex chemical systems range from rigorously accurate methods that are computationally expensive to methods that exhibit near-classical scaling with system size but are limited in their ability to describe quantum effects. In practical studies of high-dimensional reactions, neither extreme is the best choice: frequently a high-level quantum mechanical description is only required for a handful of modes, while the majority of environment modes that do not play a key role in the reactive event of interest are well served with a lower level of theory. In this feature we introduce Modified Filinov filtration as a powerful tool for mixed quantum-classical simulations in a uniform semiclassical framework.