Author

Lin Chen

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Preprint Jul 2026

Entanglement Quantification via Symmetric Extensions: A Resource Theory Hierarchy

We introduce a hierarchy of entanglement measures Ek based on k-symmetric PPT extensions. Each Ek, defined via a minimal eigenvalue shift and computed by semidefinite programming, is faithful, convex, and monotone under free operations. The hierarchy strictly refines PPT-robustness at k = 1, detects bound entanglement...

Enmin Shao, Lin Chen, Huixia He · 0 citations