Q-circuit Tutorial
  Q-circuit is a list of macros that greatly simplifies the construction of quantum circuit diagrams (QCDs) in LaTeX with the help of the Xy-pic package. This tutorial should help the reader acquire the skill to render arbitrary QCDs in a matter of minutes. Q-circuit is available for free at http://info.phys.unm.edu/Qcircuit/. 
Bryan Eastin and Steven T. Flammia