CP1 spinor representation
= CP1 spinor representation
{c}
{title2=$CP^1$ spinor representation}
The CP1 spinor representation writes a unit vector as $n_i=z^\dagger\sigma_i z$ with $z^\dagger z=1$. The phase redundancy $z\mapsto e^{i\alpha}z$ identifies normalized spinors that represent the same point of the <two-sphere>.