Work

Path-integral approach to quantum acoustics

Year: 2026

Type: article

Abstract: A path-integral approach to quantum acoustics is developed here. In contrast to the commonly utilized particle perspective, this emerging field brings forth a long neglected but essential wave paradigm for lattice vibrations. Within the coherent state picture, we formulate a non-Markovian, stochastic master equation that captures the exact dynamics of any system with coupling linear in the bath coordinates and nonlinear in the system coordinates. We further demonstrate the capability of the presented master equation by applying the corresponding procedure to the eminent Fröhlich model. In general, we establish a solid foundation for quantum acoustics as a kindred framework to quantum optics, while paving the way for deeper first-principle explorations of non-perturbative system dynamics driven by lattice vibrations.

Source: Physical review. B./Physical review. B

DOI: 10.1103/8y23-m2mq

Authors: Joost V. de Nijs, Anton M. Graf, Eric J. Heller, Joonas Keski-Rahkonen

Institutions: Harvard University, Delft University of Technology

Language: English

Topic: Quantum Mechanics and Applications

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, Studienstiftung des Deutschen Volkes

Award: G4024394687