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Sponsored Artificial Intelligence: A Modern Approach, Global Edition Artificial Intelligence: A Modern Approach, Global Edition

Author

Hao-Chung Cheng

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Preprint Oct 2026

Universality Sacrifices Reliability in Classical-Quantum Channel Coding

Universal channel coding enables communication without a complete description of the channel. For classical channels, universal codes can attain both capacity and the optimal high-rate reliability. We show that this compatibility fails for classical-quantum channels in general; that is, the optimal reliability in the c...

Kaito Watanabe, Masahito Hayashi, Takaya Matsuura et al. · 0 citations
Preprint Aug 2026

Strong Converse Exponent of Quantum State Merging

We determine the strong converse exponent for the entanglement cost of quantum state merging, showing that it is characterized by the optimized $\alpha$-$z$ conditional R\'enyi entropies with $z=\alpha/2\in[1/2,1]$. This contrasts with the sandwiched conditional R\'enyi entropies that typically govern strong converse e...

Mario Berta, Hao-Chung Cheng, Roberto Rubboli et al. · 2 citations · ⚡1

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