Quantum Computation and Quantum Error Prevention

QWiki is up!

Here's a random formula (from www.qubit.org):

<amsmath>U_{\text{QFT}}=\frac{1}{\sqrt{N}}\sum_{x,y=0}^{N-1}e^{2i\pi xy/N}\left | y \right>\left < x \right |. </amsmath>