Wavelength-Uniform Quantum Algorithms for Mixed-State Quantum Dynamics
Abstract
One of the main challenges in numerical simulation of quantum dynamics is the prohibitive cost in the semi-classical regime, in which the de Broglie wave length is small compared with the characteristic length scale and the solution is highly oscillatory. For the von-Neumann equation for mixed-state quantum dynamics, this difficulty is overcome by using the Weyl variables, under which the solution is not oscillatory. Furthermore, we use the integral representation of the potential difference, which robustly captures the classical limit as the semi-classical parameter approaches zero. By using exact Hermite moments and quantum singular value transformation to treat the polynomial and sparse coordinate matrices of the dense projected smooth non-polynomial potentials respectively, we obtain a quantum algorithm efficient for {\it all} ranges of wave lengths, with complexity {\it polynomial} in the spatial dimension and discretization and query bounds containing {\it no} negative powers of the small wavelength. Thus it can capture the correct physical observables even if the spatial grid does not resolve the frequency, hence defying the Nyquist-Shannon sampling theorem.
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BibTeX
@misc{jin2026wavelengthuniform,
title = {{Wavelength-Uniform Quantum Algorithms for Mixed-State Quantum Dynamics}},
author = {Shi Jin and Chuwen Ma},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.07384},
eprint = {2609.07384},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.07384},
}
RIS
TY - UNPB
TI - Wavelength-Uniform Quantum Algorithms for Mixed-State Quantum Dynamics
AU - Shi Jin
AU - Chuwen Ma
PY - 2026
DA - 2026/09/28
PB - arXiv
DO - 10.48550/arxiv.2609.07384
UR - https://arxiv.org/abs/2609.07384
AB - One of the main challenges in numerical simulation of quantum dynamics is the prohibitive cost in the semi-classical regime, in which the de Broglie wave length is small compared with the characteristic length scale and the solution is highly oscillatory. For the von-Neumann equation for mixed-state quantum dynamics, this difficulty is overcome by using the Weyl variables, under which the solution is not oscillatory. Furthermore, we use the integral representation of the potential difference, which robustly captures the classical limit as the semi-classical parameter approaches zero. By using exact Hermite moments and quantum singular value transformation to treat the polynomial and sparse coordinate matrices of the dense projected smooth non-polynomial potentials respectively, we obtain a quantum algorithm efficient for {\it all} ranges of wave lengths, with complexity {\it polynomial} in the spatial dimension and discretization and query bounds containing {\it no} negative powers of the small wavelength. Thus it can capture the correct physical observables even if the spatial grid does not resolve the frequency, hence defying the Nyquist-Shannon sampling theorem.
ER -