I strongly encourage you to pick up a copy of the book [0] this selection is from.
[0] https://en.wikipedia.org/wiki/Surely_You%27re_Joking,_Mr._Fe...!
[0] https://en.wikipedia.org/wiki/Surely_You%27re_Joking,_Mr._Fe...!
• Feynman Lectures On Computation
• QED: The Strange Theory of Light and Matter
The first book is a nice way to get started with reversible computation and quantum computing.