Entanglement Distillation of some Rank-Five Symmetric NPT States in Two-Qutrit Systems

Yuwei Lei; Zihua Song; Lin Chen; Mingju Liu

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arXiv · 2608.03710

Entanglement Distillation of some Rank-Five Symmetric NPT States in Two-Qutrit Systems

Yuwei Lei·Zihua Song·Lin Chen·Mingju Liu

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Abstract

Entanglement distillation is a fundamental task in quantum information processing. In this work, we investigate the distillability properties of a class of two-qutrit symmetric NPT states of rank five. We resolve the 1-distillability problem for this class by proving that the previously open interval of the eigenvalue parameter is 1-undistillable. For the 2-distillability, we uncover a structural obstruction showing that no Schmidt-rank-two vector has a negative expectation in the relevant subspace. We also perform numerical investigations to explore the 2-distillability beyond this obstruction.

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Yuwei Lei, Zihua Song, Lin Chen, Mingju Liu. 2026-08-04. Entanglement Distillation of some Rank-Five Symmetric NPT States in Two-Qutrit Systems. https://arxiv.org/abs/2608.03710

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