Dresden 2026 – scientific programme

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QI: Fachverband Quanteninformation

QI 14: Quantum Information Poster Session

QI 14.28: Poster

Wednesday, March 11, 2026, 18:00–21:00, P4

Making entanglement witnesses robust to measurement errors — •Elisa Monchietti and Otfried Gühne — Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, 57068 Siegen, Germany

In recent years, a variety of methods have been developed to characterise quantum entanglement, among which entanglement witnesses are one of the most widely studied tools. A major limitation of these operators, however, is their high sensitivity to measurement imperfections, which can lead to false positives in the detection of entangled states. In realistic experimental scenarios, even with advanced error-mitigation techniques, measurement errors arising from device imperfections and external noise cannot be completely eliminated. In this work, we aim to characterise quantum correlations in a more realistic framework by explicitly accounting for imprecise measurements. To this end, we investigate correction terms that can be incorporated to compensate for the effects of measurement misalignment and device imperfections. In particular, we study the existence and construction of entanglement witnesses for multiqubit systems that remain robust against misalignment errors.

Keywords: entanglement; witnesses