The previously open interval of the eigenvalue parameter for a rank-five symmetric NPT two-qutrit state family is proven 1-undistillable, and a structural obstruction to 2-distillability is identified.
Entanglement distillation on symmetric two-qutrit entangled states of rank five.International Journal of Quantum Informa- tion, page 2550039, 2026
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Entanglement Distillation of some Rank-Five Symmetric NPT States in Two-Qutrit Systems
The previously open interval of the eigenvalue parameter for a rank-five symmetric NPT two-qutrit state family is proven 1-undistillable, and a structural obstruction to 2-distillability is identified.