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arXiv · 2604.02420

Bounding the entanglement of a state from its spectrum

Jofre Abellanet-Vidal·Guillem Müller-Rigat·Albert Rico·Anna Sanpera
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Abstract

We introduce a framework to upper bound the entanglement content of a bipartite quantum state from its spectrum alone. Using linear maps and their inverses, we derive rigorous constraints on the maximal entanglement that can be activated under global unitary transformations. We use as entanglement quantifiers the negativity and the Schmidt number; however, our framework is general and applies to any other entanglement measure. Our approach yields compact analytical sufficient criteria for bounding the entanglement of full-rank states in arbitrary dimensions and reveals new spectral constraints on Schmidt number witnesses.

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Jofre Abellanet-Vidal, Guillem Müller-Rigat, Albert Rico, Anna Sanpera. 2026-04-02. Bounding the entanglement of a state from its spectrum. https://arxiv.org/abs/2604.02420

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