Sudarshan E.C.G.Facchi, PaoloMarno, Giuseppe2012-10-032012-10-032010Bangalorehttps://elibraryofyoga.com/handle/123456789/1085The States of Quantum systems are described by wave functions (state vectors in Hilbert space) or density matrices. The difference between quantum states can be associated with a distance between the state vectors or the density matrices.enClassical and Quantum FisherGeometrical FormulationQuantum MechanicsArticle