I would like to see where you found that information
I checked the manhattan project wiki page and the word
quantum doesn't seem to be on the page.

https://en.wikipedia.org/wiki/Manhattan_Project

I also clicked on the origins link in the page.

https://en.wikipedia.org/wiki/Manhattan_Project#Origins

I then preceded to check the individual pages of each of
the people underlined below who are credited with the discovery of nuclear fission.

Quote:
The discovery of nuclear fission by German chemists Otto Hahn and Fritz Strassmann in 1938, and its theoretical explanation by Lise Meitner and Otto Frisch, made the development of an atomic bomb a theoretical possibility.


and none of the above listed people seem to have used quantum anything in the discovery of nuclear fission or making the development of a nuclear bomb a theoretical possibility
because the word quantum is also not on any of their wiki pages which tells me that they did not use quantum anything
in their work or experiments.

x otto hann
x fritz strassman
x lise meitner
x otto frisch

perhaps yourself or orac can place a link that tells just
how some type of quantum something was actually used in
the making of the atom bomb.

but the most important link would be a link that states that

Quote:
The development of nuclear weapons was based purely on QM.


from what I have already read the "purely based" part
seems to be out of place or misrepresented.

where did you read this at?

I did find this on the otto Frisch wiki page however that
clearly describes how fission was first found in an experiment

https://en.wikipedia.org/wiki/Otto_Robert_Frisch#Overview

Quote:
During the Christmas holiday in 1938 he visited his aunt Lise Meitner in Kungälv. While there she received the news that Otto Hahn and Fritz Strassmann in Berlin had discovered that the collision of a neutron with a uranium nucleus produced the element barium as one of its byproducts. Hahn, in a letter to Meitner, called this new reaction a "bursting" of the uranium nucleus. Frisch and Meitner hypothesized that the uranium nucleus had split in two, explained the process, estimated the energy released, and Frisch coined the term fission to describe it


the above really sounds like this experiment was the base of
any future results of nuclear experiments that split atoms , or cause nuclear fission , and would be the experiment and
the physics that nuclear weapons were purely based on.







3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.