- quantum jump - (physics) an abrupt transition of an electron or atom or molecule from one quantum state to another with the emission or absorption of a quantum
--1 is a kind of leap, jump, saltation
- quantum leap, quantum jump - a sudden large increase or advance; "this may not insure success but it will represent a quantum leap from last summer"
--2 is a kind of jump, leap
- quantum leap, quantum jump - a sudden large increase or advance; "this may not insure success but it will represent a quantum leap from last summer"