During what time period did relational quantum mechanics start to become studied ?
Modern attempts to embrace a relational approach with interpretations of quantum mechanics have been tried many times , ranging from Everett 's relative - state interpretation ( Everett , 1957 ) , sigma algebra of interactive properties ( Kochen , 1979 ) , quantum reference systems ( Bene , 1992 ) , quantum theory of the universe ( Smolin , 1995 ) , to relational quantum mechanics ( Rovelli , 1996 ) .