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arXiv · 2603.25345

Can every set of incompatible measurements lead to genuine multipartite steering?

Lucas E. A. Porto·Lucas Tendick·Daniel Cavalcanti·Roope Uola·Marco Túlio Quintino
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Abstract

Measurement incompatibility and bipartite quantum steering are known to display a strong connection: a set of measurements is incompatible if and only if it can lead to bipartite steering. Despite such a close link between these concepts in bipartite scenarios, little is known in the multipartite setting, where notions of genuine multipartite correlations play major roles. In this work we prove that, as in the bipartite case, incompatibility is also necessary and sufficient for genuine multipartite steering in any multipartite scenario with a single uncharacterised party. Interestingly, genuine multipartite steering can be extracted from any set of incompatible measurements using states which are not SLOCC equivalent, such as GHZ and W states. In contrast, we prove that this result does not hold in scenarios with more than one uncharacterised party, by presenting a set of incompatible measurements that can never lead to genuine multipartite steering in these cases. In order to obtain our main results, we introduce methods tailored for multipartite correlations, paving the way to understanding the role of measurement incompatibility beyond bipartite scenarios.

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Lucas E. A. Porto, Lucas Tendick, Daniel Cavalcanti, Roope Uola, Marco Túlio Quintino. 2026-03-26. Can every set of incompatible measurements lead to genuine multipartite steering?. https://arxiv.org/abs/2603.25345

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