Measurement theory for closed quantum systemsMeasurement theory for closed quantum systems
Faculty of Sciences. Physics
Theory of quantum systems and complex systems
2015Bristol :Iop publishing ltd, 2015
Journal of physics : conference series. - Bristol
7th International Workshop on Decoherence, Information, Complexity and, Entropy (DICE) - Spacetime - Matter - Quantum Mechanics, SEP 15-19, 2014, Castiglioncello, ITALY
626(2015), 7 p.
University of Antwerp
We introduce the concept of a "classical observable" as an operator with vanishingly small quantum fluctuations on a set of density matrices. Their study provides a natural starting point to analyse the quantum measurement problem. In particular, it allows to identify Schrodinger cats and the associated projection operators intrinsically, without the need to invoke an environment. We discuss how our new approach relates to the open system analysis of quantum measurements and to thermalization studies in closed quantum systems.