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The no-PPT-entanglement conjecture for mixtures of Dicke states in dimensions three and four
No-PPT-entanglement conjecture. For local dimensions $d=3,4$ , there is no PPT entanglement in the class of mixtures of Dicke states for any number of systems.
Conjectureopendicke-states ppt-states quantum-entanglementarXiv posted 2 days ago

The no-PPT-entanglement conjecture for mixtures of Dicke states in dimensions three and four