O que significa a expressão a quantum leap?

I've been a teacher for some years now and what I've noticed is that students' performance in my classes can be very unpredictable sometimes. Some have sudden and dramatic improvement over the course of an year, but some start off very well but soon fall behind the class. As far as the students who tend to improve their English language proficiency, sometimes their improvement is so dramatic and sudden I describe it as a quantum leap.

"A quantum leap is a dramatic advance, especially in knowledge or method. This term originated as quantum jump in the mid-1900s in physics, where it denotes a sudden change from one energy state to another within an atom. Within a decade it was transferred to other advances, not necessarily sudden but very important ones."

That's all for now. Talk to you next time!!!