Lecture 25 of my Quantum Theory course at McGill University, Fall 2012. Quantum Computing. Quantum Cryptography. Deutsch's Algorithm.
The course webpage, including links to other lectures and problem sets, is available at
http://www.physics.mcgill.ca/~maloney/551/
The written notes for this lecture are available at
http://www.physics.mcgill.ca/~maloney/551/551-25.pdf