Super-additivity of quantum capacity in simple channels

• URL: http://arxiv.org/abs/2505.24661v1
• Date: Fri, 30 May 2025 14:48:32 GMT
• Title: Super-additivity of quantum capacity in simple channels
• Authors: Zhen Wu, Qi Zhao, Zhihao Ma,
• Abstract summary: Super-additivity of quantum capacity is an important feature of quantum information theory.<n>Generalized platypus channel still displays the super-additivity of quantum capacity when combined with qudit erasure channels and multilevel amplitude damping channels respectively.
• Score: 17.117408296103363
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The super-additivity of quantum channel capacity is an important feature of quantum information theory different from classical theory, which has been attracting attention. Recently a special channel called ``platypus channel'' exhibits super-additive quantum capacity when combined with qudit erasure channels. Here we consider the ``generalized platypus channel'', prove that it has computable channel capacities, such as both private and classical capacity equal to $1$, and in particular, the generalized platypus channel still displays the super-additivity of quantum capacity when combined with qudit erasure channels and multilevel amplitude damping channels respectively.

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