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• 15:49, 9 November 2022 Gianfranco talk contribs created page Store:QLMde05 (Created page with "==3. Quantum instruments== ===3.1. A few words about the quantum formalism=== Denote by  <math display="inline">\mathcal{H}</math> a complex Hilbert space. For simplicity, we assume that it is finite dimensional. Pure states of a system <math>S</math> are given by normalized vectors of  <math display="inline">\mathcal{H}</math> and mixed states by density operators (positive semi-definite operators with unit trace). The space of density operators is denoted by <math>S...")