Every positive-partial-transpose channel is claimed to become entanglement-breaking after finitely many iterations, but the paper's additional uniform bound of 3 for a large family is false as stated.
Ppt composition through a qubit is entanglement breaking
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Every PPT channel has finite entanglement-breaking index
Every positive-partial-transpose channel is claimed to become entanglement-breaking after finitely many iterations, but the paper's additional uniform bound of 3 for a large family is false as stated.