a quantum leap(redirected from a quantum jump)
A sudden or important change or improvement. Gary's new job in upper management is a quantum leap forward from his old position at the factory.
a quantum leap
A quantum leap is a very great and sudden increase in the size, amount, or quality of something. The vaccine represents a quantum leap in healthcare. The scale of migration took a quantum leap in the early 1970s. Note: People sometimes say a quantum jump with the same meaning. We want a quantum jump in exports.