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Wanchen Zhang

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Preprint Aug 2026

Robust Quantum Extremal Numbers

Absolutely maximally entangled states require every reduction of at most half of the parties to be maximally mixed, a condition that is both rigid and often impossible for qubit systems. Previous work introduced the quantum extremal number, which maximizes the number of exactly maximally mixed half-body marginals, and...

Wanchen Zhang, Zicheng Han, Xian-De Zhang · 0 citations
Preprint Aug 2026

Automated Construction and Verification of Unextendible Product Bases

Unextendible product bases (UPBs) are important structures in quantum information theory, with applications to completely entangled subspaces, bound entanglement, and local indistinguishability. Since many properties and applications of UPBs are closely related to their cardinalities, one of the central problems in the...

Zicheng Han, Wanchen Zhang, Fei Shi et al. · 1 citation

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