is a Japanese

mathematician A mathematician is someone who uses an extensive knowledge of mathematics in their work, typically to solve mathematical problems. Mathematicians are concerned with numbers, data, quantity, structure, space, models, and change. History On ...

. After he received a Ph.D. in

Mathematical Physics Mathematical physics refers to the development of mathematics, mathematical methods for application to problems in physics. The ''Journal of Mathematical Physics'' defines the field as "the application of mathematics to problems in physics and t ...

and

Information Science Information science (also known as information studies) is an academic field which is primarily concerned with analysis, collection, Categorization, classification, manipulation, storage, information retrieval, retrieval, movement, dissemin ...

and Dr.Sc., he continuously worked on

operator algebra In functional analysis, a branch of mathematics, an operator algebra is an algebra of continuous linear operators on a topological vector space, with the multiplication given by the composition of mappings. The results obtained in the study of ...

quantum In physics, a quantum (plural quanta) is the minimum amount of any physical entity (physical property) involved in an interaction. The fundamental notion that a physical property can be "quantized" is referred to as "the hypothesis of quantizati ...

entropy Entropy is a scientific concept, as well as a measurable physical property, that is most commonly associated with a state of disorder, randomness, or uncertainty. The term and the concept are used in diverse fields, from classical thermodynam ...

quantum information theory Quantum information is the information of the quantum state, state of a quantum system. It is the basic entity of study in quantum information theory, and can be manipulated using quantum information processing techniques. Quantum information re ...

and bio-information. He achieved results in the fields of

quantum information Quantum information is the information of the state of a quantum system. It is the basic entity of study in quantum information theory, and can be manipulated using quantum information processing techniques. Quantum information refers to both th ...

and

mathematical physics Mathematical physics refers to the development of mathematics, mathematical methods for application to problems in physics. The ''Journal of Mathematical Physics'' defines the field as "the application of mathematics to problems in physics and t ...

. In particular, he proposed his version of quantum mutual entropy. Note this quantity is not the same as Holevo's chi quantity or coherent information, though each of them plays important role in quantum information theory. The information theoretic meaning of Ohya's quantum mutual information is still obscure. He also proposed 'Information Dynamics' and 'Adaptive Dynamics', which he applied to the study of

chaos theory Chaos theory is an interdisciplinary area of scientific study and branch of mathematics focused on underlying patterns and deterministic laws of dynamical systems that are highly sensitive to initial conditions, and were once thought to have co ...

and

biosciences This list of life sciences comprises the branches of science that involve the scientific study of life – such as microorganisms, plants, and animals including human beings. This science is one of the two major branches of natural science, the ...

as related fields.

Main research

Ohya studied multiple topics for more than thirty years, relating to quantum entropy, quantum information, chaos dynamics and life science. His main accomplishments are as follows: #Elucidation of Mathematical Bases of Quantum Channels, #Formulation of Quantum Mutual Information (Entropy), #Information Dynamics, #Analysis of Quantum Teleportation, #Quantum Algorithm, #Proposal of Adaptive Dynamics, #Applications to the life sciences. They are explained in this book .

Academic and other appointments

Academic Appointments: * 1987–present: Professor, Department of Information Sciences,

Tokyo University of Science , formerly "Science University of Tokyo" or TUS, informally or simply is a private research university located in Shinjuku, Tokyo, Japan. History Tokyo University of Science was founded in 1881 as The Tokyo Academy of Physics by 21 graduates ...

* 2004–2006 Dean, Graduate School of Science and Technology,

* 2002–2006 Committee, International Institute of Advanced Study in Kyoto * 2006–present: Dean, Science and Technology,

Università di Roma II, Copernicus University, Jena University and many others. Member of the Editorial Board of International Journals: # Infinite Dimensional Analysis, Quantum Probability and Related Topics; #

Reports on Mathematical Physics ''Reports on Mathematical Physics'' () is a peer-reviewed scientific journal, started in 1970, which publishes papers in theoretical physics that present a rigorous mathematical approach to problems of quantum and classical mechanics, field theor ...

; #Editor-in-chief of the Editorial Board of the journal

Open Systems & Information Dynamics ''Open Systems & Information Dynamics'' (OSID) is a journal published by World Scientific. It covers interdisciplinary research in mathematics, physics, engineering and life sciences based upon the fields of information processing, storage and tra ...

#Amino Acid

Books (English only)

* M.Ohya and D. Petz (1993) ''Quantum Entropy and its Use'', Springer-Verlag, TMP Series. * R.S.Ingarden, A.Kossakowski and M.Ohya (1997), ''Information Dynamics and Open Systems'', Kluwer Academic Publishers. * M.Ohya (1999), ''Mathematical foundation of quantum computer'', Maruzen Publishing Company.

References

External links

Web page at Tokyo University of Science
{{DEFAULTSORT:Ohya, Masanori 20th-century Japanese mathematicians 21st-century Japanese mathematicians 1947 births Living people