Ability of entanglement and purity to help to detect systematic experimental errors
Abstract
Measurements are central in all quantitative sciences, and a fundamental challenge is to make observations without systematic measurement errors. This holds in particular for quantum information processing, where other error sources, such as noise and decoherence, are unavoidable. Consequently, methods for detecting systematic errors have been developed, but the required quantum state properties are yet unexplored. We theoretically develop a direct and efficient method to detect systematic errors in quantum experiments and demonstrate it experimentally using quantum state tomography of photon pairs emitted from a semiconductor quantum dot. Our method can be scaled to multi-qubit systems, and we find that entanglement and quantum states with high purity can help identify systematic errors.
Cite
@article{arxiv.2503.09459,
title = {Ability of entanglement and purity to help to detect systematic experimental errors},
author = {Julia Freund and Francesco Basso Basset and Tobias M. Krieger and Alessandro Laneve and Mattia Beccaceci and Michele B. Rota and Quirin Buchinger and Saimon F. Covre da Silva and Sandra Stroj and Sven Höfling and Tobias Huber-Loyola and Richard Kueng and Armando Rastelli and Rinaldo Trotta and Otfried Gühne},
journal= {arXiv preprint arXiv:2503.09459},
year = {2026}
}
Comments
22 pages, 10 figures