From Longman Dictionary of Contemporary Englishquantum leapˌquantum ˈleap (also quantum jump) noun [countable] IMPROVEa very large and important development or improvementquantum leap in There has been a quantum leap in the range of the wines sold in the UK. The treatment of breast cancer has taken a quantum leap forward.
Examples from the Corpus
quantum leap• By placing Franco in overall command, the Nationalists made a quantum leap forward in their efforts to secure victory.• I think that there are two aspects to the question of a quantum leap in nuclear weapons.• The orchestra's performance took a quantum leap forward.• The quantum leap expressed itself partly in population levels.From Longman Business Dictionaryquantum leapˌquantum ˈleap British English, quantum jump American English a very large and important improvementQuantum leaps in information technologies have revolutionized how people work. → leap 