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Author

Kaito Watanabe

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3 papers indexed here

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Preprint Sep 2026

All you need is the universal correlation detector: A unified approach to universalize communication protocols over quantum channels

Constructing optimal quantum information protocols without complete knowledge of the underlying states or channels is a central challenge. We address this challenge by developing universal correlation detection as a common building block for quantum communication. Our detectors distinguish a bipartite state from the pr...

Kaito Watanabe, Takaya Matsuura, Ryuji Takagi · 2 citations
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 Sep 2026

Universal distillation of quantum entanglement

Distillable entanglement---the maximum rate of Bell states extractable from the given noisy entangled states via local operations and classical communication (LOCC)---has been a central quantity to characterize the operational value of entangled states. However, this operational meaning had been known to be valid only...

Ryuji Takagi, Kaito Watanabe, Takaya Matsuura et al. · 2 citations

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