The Gaussian Wave Packet Transform via Quadrature Rules

TL;DR

This paper introduces a new Gaussian wave packet transform representation using quadrature rules, notably Gauss-Hermite, reducing basis functions and providing rigorous error analysis with numerical validation.

Contribution

It presents a novel wave packet transform based on quadrature discretization, especially Gauss-Hermite, with a reduced basis and comprehensive error analysis.

Findings

Reduced basis size with Gauss-Hermite quadrature

Rigorous error bounds established

Numerical experiments confirm theoretical results

Abstract

We analyse the Gaussian wave packet transform. Based on the Fourier inversion formula and a partition of unity, which is formed by a collection of Gaussian basis functions, a new representation of square-integrable functions is presented. Including a rigorous error analysis, the variants of the wave packet transform are then derived by a discretisation of the Fourier integral via different quadrature rules. Based on Gauss--Hermite quadrature, we introduce a new representation of Gaussian wave packets in which the number of basis functions is significantly reduced. Numerical experiments in 1D illustrate the theoretical results.