[Joao Leao] What we lack is a genuinely quantum model of computation that could be mathematically tractable as the Turing or Post models and can account for entanglement in all its glory.
As far as I know you can describe certain classes of entanglement by means of Borromean rings, which are beautiful and sometimes also unpredictable. That is not much indeed, just something! http://www.liv.ac.uk/~spmr02/rings/ http://paradise.caltech.edu/~cook/Workshop/Math/Borromean/Borrring.html http://astronomy.swin.edu.au/~pbourke/surfaces/borromean/ http://seemanlab4.chem.nyu.edu/borro.html Brunniam links are also interesting in connection with QM and QC. http://www.cs.ubc.ca/nest/imager/contributions/scharein/brunnian/brunnian.ht ml http://members.tripod.com/vismath5/bor/bor7.htm Happy N.Y. (which is already coming, here in Rome) s.