Here's an extremely approachable chapter on quantum algorithms from an undergraduate algorithms course: http://www.cs.berkeley.edu/~vazirani/algorithms/chap10.

Here's an extremely approachable chapter on quantum algorithms from an undergraduate algorithms course: http://www.cs.berkeley.edu/~vazirani/algorithms/chap10.pdf http://www.cs.berkeley.edu/~vazirani/algorithms/chap10.pdf