July 2025
Beginner to intermediate
512 pages
11h 48m
English
Content preview from A Practical Guide to Quantum Computing
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Chapter 11 Finding the Period and Factoring Numbers
The sun rises and the sun sets, and hurries back to where it rises. — Ecclesiastes 1:5
This is one of the most important chapters of this book, for it introduces what many consider to be the most relevant quantum algorithm ever conceived: Shor’s algorithm for integer factorization. This was one of the first quantum algorithms to not only show an advantage over any known classical algorithms, but to do it for a problem with enormous practical significance. Indeed, Shor’s algorithm has strong implications regarding the security of certain encryption protocols that are used on a daily basis on the Internet. For all this, it’s difficult to overstate the importance of Shor’s algorithm—and we ...
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