Early Quantum Computers

What major changes would need to have occurred in order for a quantum computer to have been developed in the 1920's, and what major events would ensue given this exponential increase in computing power? Also, how would this affect the course of WWII?
 
Prevent ever regression of technological development that's ever happened and make society focused on scientific advancement?

Seriously, we don't even have Quantum Computers in the present day, and from the looks of it won't until the 2030's, it's sort of hard to find a PoD for earlier development of a (possible) technology that does'nt even exist yet.
 
Obviously, you need someone to come up with general and special relativity before Einstein. So a good first starting point is Isaac Newton; perhaps he could have developed a working theory of (say) gravitational redshift in the Principia Mathematica in 1687?

That would give 18th century physicists like Euler, LaGrange, Fourier and LaPlace a century's head start on thermodynamics. That sets up Michael Faraday to discover the electron in the 1820s. Give some lesser light the discovery of the x-ray (James Joule?) in the 1840s, and you've set up James Clerk Maxwell to develop the theory of relativity in 1860.

Voila! You've handed over what is essentially modern physics to Marie Curie and Albert Einstein at the dawn of the 20th century. From there, anything is possible, no?
 
As everyone else has already noted, you'd need a POD pretty far back to the point that anything resembling a World War in the middle of the 20th century would likely be butterflied away.
 
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