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quant-ph2026

Inverse Problem of Alchemical Resource Theory: Replication and Programming Single Out Imaginarity and Parity Asymmetry

Yasuaki Nakayama, Hayato Arai

Quantum resource theories usually begin with a prescribed free structure and ask what tasks become possible when a resource is supplied. We study the inverse problem of alchemical…

quant-ph2026

Entanglement Generation Beyond Quantum Theory: From Product States to Popescu-Rohrlich Boxes

Shun Umekawa, Akihiro Hokkyo, Hayato Arai +1

Entanglement generation is a fundamental dynamical capability in quantum information science and underpins many quantum advantages. While quantum theory enables it through unitary…

quant-ph2026

Intersubjectivity as a principle determining physical observables and non-classicality

Shun Umekawa, Koki Ono, Hayato Arai

We identify an operational principle that singles out Projection-Valued Measures (PVMs) among general Positive Operator-Valued Measures (POVMs), bridging the modern quantum measure…

quant-ph2025

Hypothesis testing and Stein's lemma in general probability theories with Euclidean Jordan algebra and its quantum realization

Kanta Sonoda, Hayato Arai, Masahito Hayashi

Even though quantum information theory gives advantage over classical information theory, these two information theories have a structural similarity that many exponet rates of inf…

quant-ph2024

Quantum Implementation of Non-Positive-Operator-Valued Measurements in General Probabilistic Theories by Post-Selected POVMs

Hayato Arai, Masahito Hayashi

It is important problem to clarify the class of implementable quantum measurements from both fundamental and applicable viewpoints. Positive-Operator-Valued Measure (POVM) measurem…

quant-ph2023

Derivation of Standard Quantum Theory via State Discrimination

Hayato Arai, Masahito Hayashi

It is a key issue to characterize the model of standard quantum theory out of general models by an operational condition. The framework of General Probabilistic Theories (GPTs) is…