Entanglement and purity can help to detect systematic experimental errors

• URL: http://arxiv.org/abs/2503.09459v1
• Date: Wed, 12 Mar 2025 15:05:06 GMT
• Title: Entanglement and purity can help to detect systematic experimental errors
• Authors: Julia Freund, Francesco Basso Basset, Tobias M. Krieger, Alessandro Laneve, Mattia Beccaceci, Michele B. Rota, Quirin Buchinger, Saimon F. Covre da Silva, Sandra Stroj, Sven Höfling, Tobias Huber-Loyola, Richard Kueng, Armando Rastelli, Rinaldo Trotta, Otfried Gühne,
• Abstract summary: We develop a direct and efficient method to detect systematic errors in quantum experiments.<n>Our results show that entanglement as well as quantum states with a high purity can help to identify systematic errors.
• Score: 28.632544413532923
• License: http://creativecommons.org/licenses/by/4.0/
• 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 like noise and decoherence are unavoidable. Consequently, methods for detecting systematic errors have been developed, but the required quantum state properties are yet unexplored. We develop theoretically 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 results show that entanglement as well as quantum states with a high purity can help to identify systematic errors.

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