Spin flips and quantum information for antiparallel spins

We consider two different ways to encode quantum information, by parallel o r antiparallel pairs of spins. We find that there is more information in th e antiparallel ones. This purely quantum mechanical effect is due to entang lement, not of the states but occurring in the course of the measuring proc ess. We also introduce a range of quantum information processing machines, such as spin flip and anticloning.