That's three times today I've run into Quantum Theory, and two of them were Shor's Algorithm: 1) https://twitter.com/mattblaze/status/418868919135260672 and 2) https://www.princeton.edu/~achaney/tmve/wiki100k/docs/Shor_s_algorithm.html and 3) https://quantumrio.wordpress.com/2013/12/18/scott-in-rio/