As far as I know this phrase is slightltslightly more specific than "big increase". The phrase is more synonymous with "[[paradigm shift]]", and presumably has arisen because quantum mechanics is one of the most important discoveries in science, and the word "leap" is in some senses similar to "advance" (eg, "a giant leap for mankind"). Hence, probably, some layman heard this phrase and assumed it meant "the advance in physics associated with quantum theory" and it stuck. Not that I'm an etymologist or a lexicographer or anything. <span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/86.30.133.31|86.30.133.31]] ([[User talk:86.30.133.31|talk]]) 19:23, 24 January 2013 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->
I think the link is simpler and more analogous than that - it's a not a big nor a small but a definite jump, without significant intermediate steps. [[Special:Contributions/212.250.220.116|212.250.220.116]] ([[User talk:212.250.220.116|talk]]) 13:07, 30 April 2013 (UTC)
