A Schmidt number criterion based on trace norms of GSIC-POVM correlation matrices is derived, recovering optimal visibility for isotropic states and proving entangled Werner states have Schmidt number 2.
Enhanced Schmidt number criteria based on correlation trace norms
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abstract
The Schmidt number represents the genuine entanglement dimension of a bipartite quantum state. We derive simple criteria for the Schmidt number of a density matrix in arbitrary local dimensions. They are based on the trace norm of correlations obtained from seminal families of quantum measurements, specifically symmetric informationally complete measurements and mutually unbiased bases. Our criteria are strictly stronger than both the well-known fidelity witness criterion and the computable cross-norms or realignment criterion.
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Schmidt number criterion via general symmetric informationally complete measurements
A Schmidt number criterion based on trace norms of GSIC-POVM correlation matrices is derived, recovering optimal visibility for isotropic states and proving entangled Werner states have Schmidt number 2.