5 papers
Indefinite causal order strategy does not improve the estimation of group action
Masahito Hayashi
We consider estimation of unknown unitary operation when the set of possible unitary operations is given by a projective unitary representation of a compact group. We show that nei…
General detectability measure
Masahito Hayashi
Distinguishing resource states from resource-free states is a fundamental task in quantum information. We have approached the state detection problem through a hypothesis testing f…
Alexander S. Holevo's Researches in Quantum Information Theory in 20th Century
Masahito Hayashi
This paper reviews Holevo's contributions to quantum information theory during the 20 century. At that time, he mainly studied three topics, classical-quantum channel coding, quant…
Measurement-Device-Independent Detection of Beyond-Quantum State
Baichu Yu, Masahito Hayashi
In quantum theory, a quantum state on a composite system of two parties realizes a non-negative probability with any measurement element with a tensor product form. However, there…
Generalized quantum Arimoto-Blahut algorithm and its application to quantum information bottleneck
Masahito Hayashi, Geng Liu
We generalize the quantum Arimoto-Blahut algorithm by Ramakrishnan et al. (IEEE Trans. IT, 67, 946 (2021)) to a function defined over a set of density matrices with linear constrai…