8 citations · 8 across the 5 of their papers we have counts for
5 papers
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…
Information Thermodynamics in Generalized Probabilistic Theories
Koki Ono, Shun Umekawa, Hiroyasu Tajima
Generalized probabilistic theories (GPTs) provide a unified framework for describing probabilistic physical theories, encompassing classical and quantum theories as well as hypothe…
On the operational and algebraic quantum correlations
Shun Umekawa, Jaeha Lee
We investigate the intrinsic ambiguity in the definition of correlation functions arising from the inevitable invasiveness of quantum measurements. While algebraic correlations def…
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…
Advantages of the Kirkwood-Dirac distribution among general quasi-probabilities for finite-state quantum systems
Shun Umekawa, Jaeha Lee, Naomichi Hatano
We investigate features of the quasi-joint-probability distribution for finite-state quantum systems, especially the two-state and three-state quantum systems, comparing different…