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The generalized unitarity method reconstructs loop-level scattering amplitudes from tree-level scattering amplitudes. We review some of the steps of this method which are necessary for applications in any quantum field theory, discuss several points of view and emphasize some of the aspects that can be easily automated. We mainly use N=4 super-Yang-Mills theory to illustrate the discussion and comment on the necessary changes for applications to super-Yang-Mills theories with reduced supersymmetry.

Sarah Croke - is a postdoctoral researcher at Perimeter Institute. From Ireland and the UK originally, she received a BSc in Physics and Applied Mathematics from University College Cork, Ireland in 2003. After a brief stint as a radio astronomer, completing an MSc in Astrophysics, she studied Quantum Information and Quantum Optics under the supervision of Prof Stephen Barnett at the University of Strathclyde, UK, receiving a PhD in 2007. She has been a postdoc at PI since November 2007. She works in quantum information theory, and is interested in both theoretical and experimental aspects. Roger Colbeck - I completed my PhD in theoretical physics at the University of Cambridge in 2006, and was for one year a junior research fellow at Homerton College, Cambridge before moving to ETH Zurich in 2007. Having been a postdoctoral researcher there for two and a half years, I moved to Perimeter Institute, where I have been since. I do research in quantum information theory and quantum foundations.