quantum jump

/K W AA1 N T AH0 M JH AH0 M P/
noun
  1. 1

    The discontinuous change of the state of an electron in an atom or molecule from one energy level to another.

  2. 2

    An abrupt, extreme change. (metaphorical)

Synonyms

Source: https://en.wiktionary.org/wiki/quantum%20jump, https://en.wiktionary.org/wiki/quantum%20leap