Piotr Kolenderski
Mathematica
Spontaneous Parametric Down Conversion
The program SPDCBIBOv1.0.nbp computes biphoton wave function, single and coincidence counts rates and purity parameter.
Estimation
If you want to see how optimal states for local estimation of cartesian reference frame orientation in Majorana representation look like RFMajorana.nbp will help you.
If you do not have Mathematica 6 you will need Mathematica Player to run both programs.