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.
Inseparable two spin- 1 2 density matrices can be distilled to a singlet form.Physical Review Letters, 78(4):574, 1997
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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.