Quantum Leap

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Physicists have observed that electrons have the remarkable ability to jump from one orbit to another without existing in the in-between space. First they sit on one orbit, then, sit in another. That is a “quantum leap“. The distance can barely be measured. To use the term “quantum leap” to mean making a giant jump is to demonstrate that you don’t know where the term came from. In addition to that embarrassment, you are using a cliché and making your speech sound brainless.

I think it is better not to use it unless you are talking about the physics phenomenon, (or the TV program) which, with any luck, you will almost never do. One can reasonably use the term to mean a sudden shift, but few people will understand what you mean. Better to find a simpler term.
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