activity
20242026
collaborators

6 papers

quant-ph2026

Structured quantum learning via em algorithm for Boltzmann machines

Takeshi Kimura, Kohtaro Kato, Masahito Hayashi

Quantum Boltzmann machines (QBMs) are generative models with potential advantages in quantum machine learning, yet their training is fundamentally limited by the barren plateau pro…

quant-ph2026

Double Markovity for quantum systems

Masahito Hayashi, Jinpei Zhao

The subadditivity-doubling-rotation (SDR) technique is a powerful route to Gaussian optimality in classical information theory and relies on strict subadditivity and its equality-c…

quant-ph2026

A Posteriori Certification Framework for Generalized Quantum Arimoto-Blahut Algorithms

Geng Liu, Masahito Hayashi

The generalized quantum Arimoto--Blahut (QAB) algorithm is a powerful derivative-free iterative method in quantum information theory. A key obstacle to its broader use is that exis…

quant-ph2025

Universal classical-quantum channel resolvability and private channel coding

Takaya Matsuura, Masahito Hayashi, Min-Hsiu Hsieh

We address the problem of constructing fully universal private channel coding protocols for classical-quantum (c-q) channels. Previous work constructed universal decoding strategie…

cs.IT2025

String commitment from unstructured noise

Jiawei Wu, Masahito Hayashi, Marco Tomamichel

Noisy channels are a foundational resource for constructing cryptographic primitives such as string commitment and oblivious transfer. The noisy channel model has been extended to…

math.RT2024

-Racah probability distribution

Masahito Hayashi, Akihito Hora, Shintarou Yanagida

We introduce a certain discrete probability distribution having non-negative integer parameters and quantum parameter which arises from a zonal spheri…