Hellwig, K.-E. Relative entropy of states in a two \(q\)-bit system. (English) Zbl 1071.81507 Doebner, H.-D. (ed.) et al., Quantum theory and symmetries. Proceedings of the international symposium held in Goslar, Germany, July 18–22, 1999. Singapore: World Scientific (ISBN 981-02-4237-9). 412-417 (2000). For the entire collection see [Zbl 0944.00084]. MSC: 81P15 Quantum measurement theory, state operations, state preparations 82B10 Quantum equilibrium statistical mechanics (general) 94A17 Measures of information, entropy PDF BibTeX XML Cite \textit{K. E. Hellwig}, in: Quantum theory and symmetries. Proceedings of the international symposium held in Goslar, Germany, July 18--22, 1999. Singapore: World Scientific. 412--417 (2000; Zbl 1071.81507)