Transformations on density operators preserving generalised entropy of a convex combination
作者： MARCELL GAÁL , GERGŐ NAGY
DOI: 10.1017/S0004972718000254
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摘要: We aim to characterise those transformations on the set of density operators (which are mathematical representatives states in quantum information theory) that preserve a so-called generalised entropy one fixed convex combination operators. The characterisation strengthens recent result Karder and Petek where preservation same quantity was assumed for all combinations.
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