Dénes Petz

Dénes Petz (1953–2018) was a Hungarian mathematical physicist and quantum information theorist. He is well known for his work on quantum entropy inequalities and equality conditions, quantum f-divergences, sufficiency in quantum statistical inference, quantum Fisher information, and the related concept of monotone metrics in quantum information geometry. He proposed the first quantum generalization of Rényi relative entropy and established its data processing inequality.

He has written or coauthored several textbooks which have been widely read by experts in quantum information theory.

He has also coauthored a book in the area of mathematical physics. Provided by Wikipedia