A solution to 2-copy distillability of Werner states

• URL: http://arxiv.org/abs/2607.21367v2
• Date: Mon, 27 Jul 2026 03:28:09 GMT
• Title: A solution to 2-copy distillability of Werner states
• Abstract summary: We prove that Werner states in arbitrary dimension are 2-copy distillable if and only if they are 1-copy distillable.<n>This is an important step on determining whether every non-positive partial transpose (NPT) state is distillable.
• Score: 15.936601510276361
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: Entanglement distillation is a fundamental task in quantum information theory. In this work, we prove that Werner states in arbitrary dimension are 2-copy distillable if and only if they are 1-copy distillable. This answers the longstanding open question of the 2-copy distillability of Werner states. This is an important step on determining whether every non-positive partial transpose (NPT) state is distillable, which remains one of the central open problems in the field of entanglement distillation.

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