For Bell-diagonal qutrits with Weyl structure, violating the PPT criterion is necessary and sufficient for 1-distillability and yields a noise-robust distillation protocol.
Watrous, Many Copies May Be Required for En- tanglement Distillation, Physical Review Letters93, 010502 (2004)
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Noise-robust 1-copy distillation protocol for all distillable Bell-diagonal qutrits
For Bell-diagonal qutrits with Weyl structure, violating the PPT criterion is necessary and sufficient for 1-distillability and yields a noise-robust distillation protocol.