Classical-path integral adaptive resolution in molecular simulation: towards a smooth quantum-classical coupling

TL;DR

This paper introduces a novel algorithm using path integral methods to enable smooth, adaptive coupling between classical and quantum models in molecular simulations, addressing a key challenge in multiscale modeling.

Contribution

The paper presents a new approach for classical-quantum adaptivity in molecular simulations using path integral techniques to facilitate continuous transitions.

Findings

Demonstrates a continuous transition between classical and quantum models

Provides a framework for adaptive resolution in molecular simulations

Addresses the challenge of coupling classical and quantum descriptions

Abstract

Simulations that couple different classical molecular models in an adaptive way by changing the number of degrees of freedom on the fly, are available within reasonably consistent theoretical frameworks. The same does not occur when it comes to classical-quantum adaptivity. The main reason for this is the difficulty in describing a continuous transition between the two different kind of physical principles: probabilistic for the quantum and deterministic for the classical. Here we report the basic principles of an algorithm that allows for a continuous and smooth transition by employing the path integral description of atoms.